^^ Nope that wont happen, the ppl who produce stellar exclusives for Sony are mostly Sony's first party studios for e.g : SCEA Santa Monica (God of War series), Guerrilla Games(Killzone series), Naughty Dog (Uncharted series) etc.
Xbox's only notable exclusives include Gears of War (Epic Studios) and Halo (Bungie). Bungie is now a independent studio and so is Epic. They can produce games for other platforms too unlike Sony's studios which never went away from Playstation.
M$ should learn that money cannot buy everything. 360 exclusive like Mass Effect 2 went multi-plat while none of the Sony's first party exclusives went multiplat right from PS2 era.