1. I don't think we need a phone and a home computer. There's really very little reason at this point why they can't be one and the same. A device that plugs into a dock at home and becomes a home computer, and when you undock it it becomes a phone. And I don't mean the ham-handed attempts we've seen, I mean a full-on contextual OS switch.
2. I think the next major evolution in phones should be removing the screen. We need to develop a voice assistant technology which retains context and can "understand" in a more conversational style, but I think that once we've jumped that hurdle there would be plenty of people—for whom phone-staring is currently an act of boredom or filling time—who would willingly get rid of that screen in favor of a voice assistant.