Making Resident Evil GameCube exclusive was a terrible decision by Capcom, and I hope for their sake that the announcement is that they will be porting both RE0 and the remake to PS2. Both of those games deserve to sell much more than they have up to this point, and they aren't going to do so on GameCube.
I saw some US sales figures recently that showed that, up to June 2003, Code Veronica X on PS2 had sold more than both 0 and the remake combined. (Sorry, I don't have the figures handy) Think about that for a second, and then go further and consider that Code Veronica was a port. Considering the popularity and following the franchise had during the PSone days, those figures can be considered as nothing short of abysmal. And it's not like the quality of the product is to blame either.
Capcom would certainly have been subsidised by Nintendo for making the franchise exclusive, but Nintendo would never have given Capcom enough that would make them better off than had they made the games for PS2.
Chris.