Re: DX 11 Games
It's a matter of "follow the money".
No developer can afford to release a game working only on 10% of the market, except if they have huge backing (think MS sponsoring the game, like halo for PC only working on Vista).
Most companies want to sell their goods and will make it usable by the largest amount of people.
Which is why so many developers are screaming at intel to increase the perfs of their integrated graphics, as those power over 50% of the world's PCs...
As the universe is curved, there cannot be a straight answer...