"*scratches his head* Each GTA game has sold upwards of 10 million worldwide, just on PS2. Microsoft would have to hand out moneyhats of nearly 500 million to convince Rockstar to make the series exclusive(there's no way a 360 GTA would even approach 5 mill).

It's just not smart business. It doesn't matter if the 360 is a success or not, GTA may be multiplatform but it's mainly a Playstation franchise. The same could be said about Splinter Cell on the XBOX, I guess, sort of."
At this point in time the user base of the PS3 and X360 is the same. I know that i expect the PS3 to trounce the X360, but NOTHING is given anymore. I expected the PSP to thrash the DS, and that simply hasn't happened.
There's too many unknowns on both sides, but it's too early to start thinking the PS3 has it all in the bag even though it looks highly likely it will - what if the PS3 is pushed back to 2007? What if it is too highly priced? etc... etc...
personally - i think the PS3 _will_ be pushed back into 2007 (US/EU), if that happens, then by the time the PS3 launches, the X360 might have a decent userbase. In which case, i'd fully expect MS to put out a timed exclusive X360 version, then release an enhanced PS3 version some time later.
"there's no way a 360 GTA would even approach 5 mill"
If GTA was a 360 exclusive and there was to be no PS3 version, i think you'd suddenly find 5 million X360s sold straight away!
But it's not going to be , so that's that
" Each GTA game has sold upwards of 10 million worldwide, just on PS2."
Another thought : then whack the new one on PS2. Port to X360 and PS3 later if you can be bothered. This might well happen - there are still a lot of big games planned for the PS2 stretching into 2006. Is it a strong enough line up to keep people off first gen X360? Throw GTA4 into that equation and it gets a little interesting.
At this moment in time, maybe it is - and this is why i keep thinking PS3 = 2007. Support Ps2 and especially the PSP then concentrate on PS3/PSP.
Infact, maybe it was ALWAYS meant to be 2007 and sony have strung MS up like a kipper?