I think you make a good point there, but at this point my Diablo fanboy has achieved a level over 9000 and I'm pretty much ignoring that. lol.
I mean, the last game I played for over 100 hours after quitting Ultima Online for the second time was Diablo 2, so Diablo 3 is pretty huge for me. I just got a 8600GT but I'm willing to dump my cash for a new power supply and 8800GT (or whatever it is that's top of the line in five years when this game is out) just to run this game. I'd like Blizzard to put this game on the console to just to test the market, but this at the very least gives me a reason to continue to upgrade my PC, just like the Starcraft 2 announcement.
If anything, Blizzard is always there to prove PC gaming is far from dead.