While PC Gaming is by no means dead, or even dying, per se, it is in a decline. And like people have said, this is a slump that will eventually pick back up. Market trends.
But supporting Blizzard is supporting PC Gaming, albeit indirectly. But no more so than supporting any single Developer/Publisher. Well, less so now that they're owned by Activision... (Which I abhorrently oppose btw, but what're ya gonna do?)
But if you really think that buying any PC game produced by EA is supporting the market, then you really, really, REALLY need to take a damn good look at how many games EA publishes that aren't direct-ports of console games, or simul-released on both Consoles and PC's. They don't sink any real money into PC games, they make Console games, and then spend a little extra to port them for near exponential profit, provided they move enough copies. Yes, I'm biased against EA. But I've become biased based on objective reasoning and observation, not just because I disapprove of their business practices. (Which is another reason in and of itself, but not really on-topic.)
Which is the lesser evil...? There's a lesser evil between IPhone's and any product M$ produces? Ehh, I guess I'd have to go with XBox... The ORIGINAL XBox, clunky controller and all. Speaking of...
I think the bet was to see who could piss off the PC market more, via destroying the market. Jobs got the one-up on Gates here though, by choosing to avoid the bet entirely, and cause Gates to destroy a market he's currently out-pacing Jobs in anyway. Unfortunately for Jobs, he underestimated the incompetence of M$, forgetting that anything they release will be broken 9 times out of 10... XBox360... Neither one of them is winning the bet. =P