Ireland will be even more dangerous wih James Lowe and i think he qualifies next year in time for the RWC?? Going by Lowe's current deadly form for Leinster Hansen will be kicking himself for letting him go. Irish centre Bundy Aki instrumental in the Chiefs Super Rugby ***les another homegrown player that almost made the ABs as well. Arguably a better centre than some of the ones we've got. Theses are the types of players that can come back and bite us in the butt.
I 'm not sure if you rate England either or not but It would be arrogant to think we are'nt threatened by a number of NH teams. England is evolving in to a real threat with plenty of depth and write off the wily Eddie Jones as a clown at your peril. At the end of the day sport is unpredictable by nature- try taking a multibet on all the favourite teams to win and you'll lose almost everytime.
Rotation can also bite you in the butt, albeit a necessary evil resting key players through big tournaments.... rotate at your peril - see what happened with SA vs Japan in 2015 - they are now making a movie of that .. More recently NZ vs SA in Wellington -Rotation can be a killer.
Plenty can trip teams up so i don;t think we can get complacent or too cocky especially if we don't even know the enemy.