The complete server locks have never been done before, so we don't have any prior experiences to go off. Correct me if I'm wrong, but you are also locked for 90 days after a transfer. Regardless, Balmung probably won't open for a couple months-- possibly longer.
Learn what lesson? It isn't the playerbase's fault SE allowed transfers to a supposedly overflowing server and happily collected $18 each time. Frankly, the cynic in me thinks they will open up Balmung and Gilgamesh within a couple months just to collect more money from the inevitable transfers back.
