Valve certainly. I really wish for EA and Activision together to go bankrupt (the IPs won't die, they'd get sold to better managers in a clearance sale). They hurt the industry tremendously...
That's wishful thinking of course. The standards of most gamers are so low, and so predictable, that those companies would be the last ones to bankrupt. I think what WILL help, though, is the growth of gaming outside the US (i.e., in Eastern Europe, South America, etc.). Largely because there, (in my impression), a different type of games is generally more popular - ones that EA and Activision have less of a hold over. But yeah, again, that's wishful thinking.