Considering they still support PS2 for FFXI, I'd say this is very unlikely, if not entirely impossible. Which is a shame, sure, but to play devil's advocate I'd have to say it was clear going into this (long before official release) that PS3 is a part of FFXIV. Is there a precedent for anything like this anyway, a large P2P Japanese MMO to drop support of a platform that the game launched on? If so, I'd be interested to know how it worked out.