So what are you calling “stale”, and what would be “success like SC2”?
I have a couple friends who are semi-pro FPS players. One of them won $2K a few months back from a CoD Blops tourny. The fact that tournys with such large pots are available, to me, somewhat discredits your claim that FPS comp is “stale”. I think the issue may be that the genre itself is just so widely popular that there is a huge pool of competition at even the organized clan level, so its very difficult to be good enough to separate yourself from the masses.
There are still a handful at the top who manage to make a living doing nothing but getting sponsored to play FPS. I don’t know the numbers, is it really that much less than the number of SC2 sponsored players?