Even thats not trust for indie developers though, which are doing disturbingly well in the PC market. Just look at terraria or minecraft as examples, with seriously impressive sales figures for very low development costs.
Every company has to start somewhere and you cant really dive straight into $100 million dollar budgets for a game when you have no proven back catalogue, as you wouldn't get funding from banks or partners for a start.
As was stated PC is left with indie, mmos and occasional strategy games. Rest of the genres want to be on consoles.
For last last couple of years as far as I know the PC games market has been shrinking. There's only so much money a project can get from a PC game. There is no incentive to do a big budget PC game because the market is no big enough to return a profit to it. While in the console market the horsepower is not big enough to require big budget to drive the technology forward.
Blizzard has been living off WoW and not trying anything new or exciting, sc2 is not moving technology forwards its unbalanced sc1 with better graphics that was a sure thing...that still got much less sales than mw2.
Valve has been living off old engine, they even admitted in heignsight they should have invested more time and money into improving their engine. Portal 2 ps3 steamworks, L4D x-box exclusive, they're tasting console money and they're liking it. They even already said they're not developing a new engine, they're just threw a lot more people to improve the source engine...and only recently.
Now with both Valve and blizzard(diablo 3) dipping their toes in the console market you can only expect them to start concentrating on console sales more instead of PC.
There is absolutely no incentive for the developers to invest lots of money into PC only games and drive the technology forward because the market is not big enough.
Look at ps3, its easier to develop it for xbox and then port it to ps3, ps3 has more horsepower but all games run worse on ps3 because they're all ported. It breaks my heart when such amazing ps3-only games get poor poor sales and no surprise money is primerely...at least was last year in xbox.
You can see how the industry's progress is slowed down by what creates most profit with least cost(effort time). Why make a PC games when the same game released on x-box would yield more money? The answer is what is happening right now.