Simple answer: It's too late. They needed to have done so at launch.

To compare: WoW did this, and it was good; RP communities formed solidly on those servers, and although server identity has long since diluted in that game (for a whole host of reasons) lots of that activity is still kicking, though it can be tricky for new players to get in on it. It worked because they were clear from that get-go what those servers were for, and had lots of time to settle into a routine for a matter of years prior to the changes to the server structure.

As of now, in FFXIV, others in this thread have explained why places like Balmung and Gilgamesh are, and most likely always will be, the place to find actual RP communities in FFXIV.

That having been said, don't let this stop you from RPing. Even if it's just running all your messages in raids through a "Jacke from the Rogue's Guild" dialect filter (which is a grand old time lemme tell ya)