Very smart move by SE! Now, everyone with a PS3 who is on the fence about whether to wait for the PS4 can just buy the game and get started.
And, people like me who'll eventually be getting a PS4 can look forward to having FFXIV right off the bat!
PS3 user here and I have to agree for more than one reason. Those of us that played FFXI always wanted a PS3 upgrade so we could get a better experience and stop hearing the term, "PS2 Limitations". Now SE has made the brilliant move to give users a reason to upgrade their PS3 copy so SE can update the game thus improving performance for all players. Yoshi is really starting to impress me, well done.
There will always be PS3 limitations, but only because not everyone with a PS3 will upgrade to a PS4, nor should they have to.
I personally will be upgrading, but that's just me... you can't force them all to go pay for the hardware upgrade.
Especially since they typically cater to the JP players first and foremost, and a much larger portion of JP players are console gamers than US players by percentage... I would expect the PS3 limitations to always be a limiting factor for the game for this reason.