Here's what I want:
Image
This would NOT be hard to do, NFC is a trivial feature, water resistance is provided by aftermarket companies like liquipel that just add a coating to the device, a larger screen would be trivial to add, and Apple already has the production line set up to do a thick sapphire screen, although the rest of the device would have to get slightly thinner internally to support the screen, and stereo speakers would be trivial as well.
You actually answer the question why Apple didn't include NFC, slightly bigger screen and stereo speakers, because it is trivial. Trivial means: of little significance or value.