I think things are going in proportion to last gen, obviously the PS2 was out first and ran away with the competition. It was the best and most logical platform to develop for from the start. With the Wii, the 360 was out a year ealier, and the Wii's sucess was not as guarenteed ass the PS2's was, Wii sales did explode but PS360 sales were pretty solid too and PS3 and 360 are already above the Gamecube and Xbox (nearly for the PS3) and we're only 3/4 years in.
Obviously now we're seeing a bit more of a shift, thats my take on it anyway, shoot me down if you want!