This post seems flawed to me as it only really pertains if US for data. WW if I'm a developer I need both PS3/360 to reach full potential.
I'd say the PS3 is past the point where developers abandoning it was a risk. At worst (hello Fallout 3) it gets a game with some rough edges due to porting work, at best its the lead platform (this is still a minority but can only improve for the PS3) and mostly it gets exactly the same game.
Unless 360 moves seriously ahead WW (which I think is unlikely) it cannot tip the balance back the other way anymore IMHO.
Try to be reasonable... its easier than you think...