Not really, it's still supported in Japan, also the PS3 is much more powerful than the PS2. The PS2 was extremely weak processing wise and memory wise, the PS3 is not. There will obviously be some limitations but nothing that will limit the game, you have to remember it took them 4 years before the PS2 started to hurt FFXI.

You have to figure XIV will survive even that long for the PS3 to become a problem.