Personally I think it was more so they didn't have to make a ps3 version of stormblood. Without shutting the game down there is only so much they can do to improve stuff.

I also believe that the ps3 was able to handle more than some of the pc's some ppl are currently using out there right now. If they are able to increase the graphics more without shutting the whole game down for a revamp the next thing they'll be doing is telling the 32 bit PC users that they have to upgrade thier pc's to a 64 bit or they won't be able to run the game on it anymore. It'll be after that they'll target the ps4 users.