Great in theory -- Make sure you have PLENTY OF BACKUPS for each stage of the operation.
My main concern with these sort of "Dumbed Down" one-click type of updates that IF (and WHEN) they DO fail they are invariably next to impossible to fix.
I like the idea but I hope some of the people who design this stuff have tested them out where things FAIL - from HDD being full to Internet connection broken halfway through download etc etc.
What these people should do is BE LOCKED IN A ROOM with Nothing to eat or drink until they've tested this and provided good roll back facilities in case something breaks.
I like the idea in principle but if the roll back facilities are missing there's going to be a huge extra amount of unnecessary work for people to do in fixing these computers.