Interesting you mention the gloves / 'soiled'-fingers scenarios — as those do indeed make it pain to use TouchID! However, they usually also restrict your usage of the entire touch display as well (unless you have ultra-snazzy touch-gloves)... So it might be more of an edge-case, but a good one nonetheless.

I'm also very interested if they introduce TouchID into the next generation's screen. Would be an admission of guilt that the combo of both is the sweet-spot, and is sure to annoy X-gen1 users.

It just doesn't feel ready to me at all.