I seriously doubt this would happen....
FOR STARTERS - The GTA Series were released (even though much after the PS2 versions) they were released on Xbox
Moving on....
Rockstar have had great success developing for the Wii and the 360 so why would they stop now? It would be pointless to close off two thirds of it's now extensive fanbase.
The 360 may have reached it's limit but right now it's still kicking the hell out of the PS3 regardless of what you fanboys want to say. I own all 3 consoles so don't start flaming me and all this crap but fact of the matter is that 360 is keeping up with PS3 in graphics department, and leaving it behind with better titles, and most titles that are cross platform out perform on the 360 version.
Minus a few exclusive that the PS3 has had, all of which have been pretty rubbish except for Heavenly Sword and Uncharted, right now the only thing it has going for it is Blu-Ray
And I wouldn't give up on the Wii just yet, while it's been off to a VERY VERY bad start in my opinion with lack of quality titles, I seriously think 2008 could be a good year for that console, although it's lifespan will most likely be over by the end of the year except for the kiddies out there
28/02/2008
Melbourne, Vic