Well, let's have a look at the state of NZ rugby, position by position... Gives us a bit more to discuss!
Hookers
Current All Blacks - Andrew Hore, Keven Mealamu, Dane Coles
Up and Comers - Liam Coltman, Rhys Marshall, Nathan Harris, Ben Funnell
The major situation at hooker is not that we don't have to good players waiting in the wings, but that these players aren't getting much game time at Super Rugby level. Coltman has been stuck behind Hore, but with Hore's presumed retirement come the end of the season it looks like Coltman will be starting week after week next year. Almost certainly he will be on the All Black's end of year tour. Marshall is stuck behind Mo Schwalger and Elliot at the Chiefs, but given Schwalger's ongoing injuries he may get more game time next year. Harris was brought into the All Blacks training squad recently, somewhat surprisingly. It appears he is ahead of Canterbury's duo of Funnell and Codie Taylor, as well as James Parsons and Quentin MacDonald of the Blues. Hika Elliot and Corey Flynn have also fallen behind, though are able back ups should injury strike suddenly. Harris doesn't have a team for next year's Super Rugby, and could find a home at the Highlanders (the only NZ squad so far lacking three hookers). I don't personally see Coles as a long term option, but he could well prove me wrong.
Props
Current All Blacks - Tony Woodcock, Wyatt Crockett, Ben Franks, Owen Franks, Charlie Faumuina
Up and Comers - Joe Moody, Ben Afeaki, Ben Tameifuna, Jeffrey Toomaga-Allen
Prop is not an area of concern, by a long stretch. Woodcock only has a few years left in him, but Crockett has been good value this year, as has Ben Franks. Moody has been called into the squad recently, and is seen as the next best loosehead behind the others already mentioned. At tight head it's unlikely anyone else will get a shot, given how highly viewed Owen Franks and Faumuina are. Afeaki is a similar player to Faumuina and Toomaga-Allen was industrious in this year's Super Rugby. Tameifuna probably has the most raw talent of all the props in NZ and has many deft skills, if only he had as many brain cells as he has excess KG's he would be an international super star.
Locks
Current All Blacks - Brodie Retalick, Luke Romano, Sam Whitelock, Jeremy Thrush
Up and Comers - Dominic Bird, Matt Symons
Whilst we're a bit short of depth at lock, Retalick and Whitelock are world class, whilst Romano would make most international starting line ups. I think most people would agree Thrush is in the squad due to that lack of depth (and an injury to Bird), and Luatua is favoured ahead of him as a lock replacement anyway. Bird is very promising, and is taller than our current locks. Symons is a bit shorter, but seems to be a good tactician, calling the lineouts for Canterbury this season and captaining the second XV of the Crusaders this year. He has the added benefit of having signed for the Chiefs for 2014, who in the past few years have churned out a number of All Blacks and don't have as much depth at lock as the Crusaders, so Symons will get a few starts, at least.
Loose Forwards
Current All Blacks - Liam Messam, Steven Luatua, Richie McCaw, Sam Cane, Kieran Read
Up and Comers - Brad Shields, Matt Todd, Luke Whitelock
Our loose forwards are well stocked. Luatua has shown he can play international rugby this year, and behind him are a host of likely All Blacks. Todd likely won't get any more caps any time soon, with McCaw and Cane ahead of him (indeed Cane will do well to get more than one or two more starts this year), but Whitelock and possibly Shields are likely to be taken on the end of year tour. Whitelock can cover flanker and number eight, whilst Shields is a number six who can cover lock well enough. Victor Vito and Tanerau Latimer are great, more experienced emergency call ups. As always, loose forwards are a strength for the All Blacks, and we don't have an obvious weakness at openside flanker any more.
Halfbacks
Current All Blacks - Aaron Smith, Tawera Kerr-Barlow
Up and Comers - TJ Perenara, Augustine Pulu
We have a great triumvirate of halfbacks at the moment, with Smith, Kerr-Barlow and Perenara all highly promising. TKB and Perenara are yet to start a match, and will fight it out for that bench spot on the end of year tour. The selectors have indicated that Pulu is the next in line, with Weepu and Ellis experienced back ups.
First Five
Current All Blacks - Daniel Carter, Aaron Cruden, Beauden Barrett
Up and Comers - Tom Taylor, Colin Slade
First five is even more stocked than halfback, with the only concern being Carter's frailty and a lack of continuous game time at the top level for his reserves. Cruden and Barrett have shown themselves to be strong performers, however. Taylor was great in his cap earlier this year (to be honest he probably had the best debut for an NZ first five in a long time) and Slade has been in the squad before whilst still being young. Guys like Anscombe are not far behind in the pecking order either.
Midfield
Current All Blacks - Ma'a Nonu, Conrad Smith
Up and Comers - Francis Saili, Jason Emery
Midfield does not have a huge amount of depth, and stocks would be vastly improved if a few overseas players were to return prior to the World Cup (namely Sonny Bill Williams and Richard Kahui). Francis Saili will be a long term All Black, and will get more game time on the end of year tour, whilst Emery stood out in a bad year for the Highlanders. Nonu will likely miss some tests early next year, whilst Smith will take a sabbatical after the Rugby Championship concludes. This will give good game time to Saili and Ben Smith, which will be invaluable. Midfield is not concerning right now, but it will be if Saili and Smith don't perform later this year. Crotty earned his first cap earlier this year, but like Thrush is probably not viewed as a long term fixture in the squad.
Outside backs
Current All Blacks - Julian Savea, Ben Smith, Israel Dagg, Charles Piutau
Up and Comers - Frank Halai, Tim Nanai-Williams, Johnny McNicholl
The All Blacks always have a number of great players waiting in the wings to earn a place as one of the outside backs in the squad. With Jane returning from injury soon, and the fantastic performances of the starters this season, I think we're in as good a position as we've even been.
Taking all this into consideration, a likely 36 man squad would consist of:
Hooker (3) - Mealamu, Coles, Coltman
Prop (5) - Woodcock, Crockett, Franks, Franks, Faumuina
Lock (5) - Romano, Retalick, Whitelock, Thrush, Bird
Loose Forward (6) - Messam, Luatua, Shields, McCaw, Cane, Read, Whitelock
Halfback (3) - A Smith, Kerr-Barlow, Perenara
First Five (4) - Carter, Cruden, Barrett, Taylor
Midfield (3) - Saili, Nonu, B Smith
Outside Back (6) - Savea, Dagg, Jane, Piutau, McNicholl, Halai
With other possibilities being either Marshall or Harris instead of Thrush or Shields, or another prop in place of one of the same two players.