They didn't the right thing.

There was a bunch of EU players and SE let them choose their servers per comunity. And at least French and Spanish community choose Moogle for sure, and I've seem a lot of italians too. UK players are mainly going for Moogle too. That's just too much... But it has a cool name and a lof of communitys choose it, so now there's a problem. SE should have guide those comunities with a rational distribution and not let them handle theirselves.

Now a lot of people can't play where they want, not just because of friends but also because of language issues and because they can't be with the free companies they already joined in forums, waiting for the game, and some of them will leave the game because of that. It just screw up the plans for manny people.
Bad move by SE.

They could try to handdle it offering free transfers soon for some days and trying to led some communities to another less populated server.