I don't personally think Sony is in a position to be "going after" anybody. Build your services up and make your own great service viable.
Besides, i think its going to be hard enough to even stay competitive with Valve's offerings, let alone trying to "beat them". Cause really, regardless of how much SCE has learned from PS3 in regards to reacting to trends, your not going to be able to win versus open source stuff.
I say that as a pure console gamer who's never played on PC and not in any malicious way, its just the truth. Sony, devs, and retailers won't be bundling like 5 games together for 15 bucks. That's just not happening. Also, devs aren't going to be supporting mods on consoles, that's also not happening. The advantages of the PC platform are the advantages of Valve, and Sony can't compete. Stick to what your good at and hopefully ride the waves.