The more I think about it, though, we may get baseball as a de facto exclusive on the PS3 in 2013. I just can't come up with any reasonable scenario in which this license changes hands to someone with the capital, the willingness, and the wherewithal to make a game, in a single year.
The irony is, as sports leagues are constantly complaining about the skyrocketing cost of labor, set in better economic times, a similar argument might be made back to them by video game publishers.
Who knows what really happens, but you do have me very curious to find out.