We've seen Gaikai work.
You're not going to get PS4 quality - or even current generation quality videogame with Gaikai - you'll not play Journey in PS3-quality, you'll get a Mpeg4 stream, probably similar to how the better youtube let's play-compressed quality - in your download - while you upload your button presses, creating a small amount of lag, similar to remote play - but here you'll also have server-load.
Have you guys tried cloud-computing?
Am at work right now, and use cloud computing - it's horrible.
You have a hundreds of times more bandwith within xbox one than via internet - so it's not a revolutionary leveller. :-/