I don’t think PlayStation will be bought - at all. I really don’t see it happening.
Amazon is thriving on game streaming, but they are absolutely clueless about games and gaming development. Twitch is their only succesfull gaming venture.
Google is trying to enter the market through a “disruptive” platform/strategy as some people have already said above, but their service model is probably too disruptive for the gaming crowd, a bit similar to what Microsoft tried to do at the Xbox One launch (the problem was not only that, though). Yeah, gamers are people that love technology and such, but I don’t think a company will get the approval/interest of most of the gamers trying to take from them what they traditionally know as “gaming”.
That’s why I think Xbox strategy is so smart: give gamers MORE options, don’t take the options from them. xCloud as an optional/additional entry point/access to the Xbox platform is really a splendid idea: since the Eastern market will probably never adopt the Xbox platform through the traditional console, Microsoft is giving this market the option to try it in a less demanding way…if consumers like what they get through xCloud, there is even a chance they go beyond streaming games on the platform.