If Technology was like a RISK game, Consoles would be Australia. It's a small place to start, but it insidiously grows incredibly influencial relatively quickly.
I can understand why any tech giant is starting to get into gaming consoles - really, it is a very powerful market to be in control of and it is quite influencial on the development community.
I agree on this, I can also see Google battling OUYA for that small cheap mobile console market. If Google were to make a 99$ console like the OUYA with it's influence and resources, it could easily destroy the OUYA in games, power, performance, and cost-value.
Though if Google went against Sony and MS, I don't think it would have too much of a chance unless they had some pretty damn amazing deals and features for a killer price to start with.