Square and other would have to pay. Koei who has been a loyal sony dev forever had to pay... so I dont see why Square wouldnt.
teamonkey's example is good, but this has already happenned once as it is actually - FF11 was originally intended to see an Xbox release as well - why didn't it? It's certainly not because the Xbox was incapable. Microsoft enforced all Live! games to be run off Microsoft Live! servers - Square wanted to keep the game strictly on their servers so the Xbox never saw a release. Microsoft lost out big time there and they realise it - so much so that the recent 'FF11 on Xbox360' announcement has come in to fruition because Microsoft folded and finally agreed to let Square run the show. Square gets their way.