I get where you're coming from, but think about this from a more realistic perspective.
You yourself said that Blizz making an MMO that differed mechanically from WoW would be 'killing the golden goose 101'. Well, what if Blizz vanished, taking WoW, Starcraft 2 and Diablo with it? You want to talk about what's good for the industry - how would effectively destroying all the positions those three games have made for people who make, update and maintain them? You now have a mess of skilled, experienced programmers, coders, etc. with nowhere to go. And if you think they'll just magically replace lesser people in the same positions in other companies, you are being amazingly optimistic.
Second, while Blizz may not be generating a lot of new, creative IPs, at least what they ARE making is quality work. There's a reason WoW has not only kept, but maintained over 10 million subscribers at a point when most MMOs are down to the tens of thousands at best, despite having a $15/month subscription fee. There's a reason Starcraft 2 received accolades more or less across the board. Would you rather they start cranking out original IPs that aren't as good, while causing their flagship titles to suffer as well? That'd be ridiculous. That's not to mention how much time and effort (I won't mention money 'cause I doubt Activision Blizzard is hurting too much in that department) it takes to make a single game, let alone make it well.
Blizzard is not a technicolor whirlwind of shiny new ideas, perhaps, but why is that so important? Not every writer tries to create literary pieces that are on the cutting-edge of imagination - someone has to write the Funnies, after all - and not every game developer is trying to push the limits of the medium with every release. Besides, who's to say that Blizz won't eventually have a brilliant idea that they'll make into a game? They'd be in a great position to make it if they did - plenty of funding, talented developers, and a huge fan base to boot.
Personally, I think you're taking an overly-simplistic view of 'creativity = good, Blizz = few IPs, therefore Blizz = not good'. If you wanna rant about their policies, that's fine, but even your subject title sounds kind of pretentious (though perhaps I'm not one to talk ^_^), and your argument sounds hollow. Maybe you were trying to sound too much like Extra Credits or something, I'un'no. Either way, sorry, but I'm not convinced.