I realise this might make me sound mental, but I think the England squad is actually in pretty decent shape!
Or at least, I think we have all the physical components of an excellent team, right the way through the 23. I can't speak to the mental side of it, but look at how the squad has evolved over the past couple of years:
Backs:
For about 2.5 years we ran Ford-Faz-JJ as the midfield, with Daly + another wing, Youngs at SH, and Brown at the back. I thought this was a pretty effective set of backs, for the most part. People's main complaints were Brown at FB, Youngs in general, and Daly not being a proper wing. Potential problems that kept being mentioned were 'why are there no actual ICs in England?' and 'What do we do if JJ goes down?'
Now we have options at FB, very good options at wing, and we have the OC covered very nicely by Tuilagi and a come-of-age Slade.
We've still got no actual IC, but it seems like Tuilagi can cover there in a pinch, and I still think Faz is a very good shout there. (Assuming he can sort out that thing where he tries to one-man blitz defence! I think JJ being defensively excellent covered for Faz in a way I'm not convinced Manu can, but hopefully the fact that we have a defence coach will count for something)
This is why I'm a bit annoyed that Ford-Faz-Manu wasn't used at all in the 6N; you've got two 10s, two pseudo 12s and a 13 there. Stick Slade/JJ on the bench and you can get Ford-Faz-Manu, Ford-Faz-13, Ford-Manu-13, Faz-Manu-13. That's a lot of good options that get presented by just one sub.
Forwards:
About the only parts of the forwards that weren't complained about over the last two years were the locks and Billy. We had no jackalling flankers, our front row was considered simply solid at best, and we had basically no ball carriers when we lost Billy.
Front row was Marler-Hartley-Cole. Now it's Mako-George-Sinkler. That's a massive step up in dynamism, and we haven't seemed weak at scrum time. I would be perfectly happy to see Hartley slot back in as hooker and captain, if only to see if it takes the weight off Faz. But the props are much better carriers and ball handlers than they were before.
Locks have just been great forever.
Our flankers were Robshaw, Haskell, and Wood. The cupboard was so bare Eddie was playing Lawes and Itoje at 6. Now we have, hypothetically, Curry, Underhill and Wilson. Actual, dynamic flankers! Hooray!
Replacing Billy at 8 is still a problem; I think the best option from the recent crop is Wilson. But Billy's role has actually been diminished somewhat; we seem replete with excellent carriers in Manu, Sinks, Curry, Mako, etc.
Tl;dr: I think that every significant issue with the England team (apart from SH and maybe mentality) has been shown to be solvable over the last year.
Which is not to say that my vision will play out. Eddie will probably pick Te'o as hooker and Hughes as fullback for all I know. But the pieces are certainly there.