Re: Who will buy a Pixel phone?
A former co-worker always had the latest iPhone (with the most memory). But that is rare. I believe most people hang to their iPhone (which I assume you mean with 800$ phone) longer - some probably much longer (I'm still on the 4S, partly because until recently there were no "small" iPhones anymore with decent specs).
It's actually the improved camera of a newer iPhone that makes me want to buy one. The rest of the features - I hardly care because I have no use-case for them.
But I also don't need an SD-card slot or a removable battery. Never missed that on any iPhone. Had a removable battery on the previous non-iPhone phone and actually bought a replacement-battery but never bothered using it.