Reminds me of last gen. The PS2/Xbox would get a game. Then, a month or two later, the Gamecube would get the same game. The Gamecube version would sell like crap and everyone would wonder why that happened. It's because the software was "old news". If anything, the 'Cube should have gotten the game first. Then, they should have released the game on the other two systems.
Same goes for this scenario. Why release it exclusively for the console that's going to sell the most DLC, anyway? It's just going to turn the PS3 users off.