I don't think this is the right end game. Now that almost every adult in the 1st world has a mobile phone in their pocket that is more than capable of being a desktop PC, the solution we should be heading for is universal docking stations (preferably) wireless. So that wherever you are, there's a large screen+keyboard+mouse (or the phone screen can be a trackpad) and your phone just connects to those, be it at work, or home, or in a hotel.
Your main machine is in your pocket; a lot of non-techie people don't even have any other personal computing device (laptop/desktop etc.).
Personally tho, I like having a division between my work machine(s), and my home machine(s).