Only seeing 1 launch per year, I agree that they're coasting a little, but how much quicker could they make it without us all getting sick of "yet another" iPhone. Samsung release so many phones in a year that they're spamming the market with the intention of dominating through sheer numbers, even if it means releasing a load of awful phones alongside the good ones.
I think the op nailed it by saying we're into a phase of evolution. But I believe it a very real possibility that within the next 12 months, this whole facade of "there's no innovation" will vanish, because the market will be saturated with ideas, some very good, some extremely bad, and makers like Samsung will run out of useful things to include. Apple spend a year or more developing and maturing one or two truly usable functions, and everyone else just fires to dozens every 6 -12 months, thus expending the "wow" factor of these ideas prematurely, before they've had a chance to grow into game changing steps forward.
What's left then after all these ideas have already been presented? Evolving them. And as soon as people realise that for themselves, they'll stop expecting earth shattering revelations every single year, and that's when a company like Apple will be in the perfect position to blow us all away again.
Tim Cook is the kind of guy that makes choices that will pay off in the longer term, just like Steve Jobs did when he worked on the Mac.
Finally, as to why Apple have excluded NFC so far, I'm pretty sure it's because it's not all at useful yet. Nobody has any care for it here in the uk. I don't think there's a single big name retailer that uses NFC payment systems, not even the companies that sell the phones use them. Sure some of our bank cards have the feature, but few market it and those that do fail to give us a compelling reason to care. I understand its big in some countries, but until the majority are at least aware of its potential benefit, Apple won't bother.
Kudos to everyone on this thread, it makes for an intriguing read.
Peace!