I think the issue that comes from people wanting it to be like XI is that they don't realize that's exactly what is set up now, and will be if you choose to play on a JP regional server. There isn't anything special about it.

The reason why there's lower latency for XI is because it was designed for PS2 and 56k internet connections, which is nothing now and why there really isn't any latency issues for XI. Just think of how far technology and the internet has come since the launch of XI and you'll realize why this relic runs somewhat smoothly in terms of latency.

X|V is not designed with this limitation in mind. There is a lot more bandwidth available to make use of, which will increase the latency of the connection when traveling overseas, which can be offset by having a regional server for people to play on. Or, if the latency doesn't bother you and doesn't effect your enjoyment of the game, stick with a JP regional server.

As for segregation, nothing is being forced on players to be locked in a region, or even play on a server in their region. It is a choice for the player, as well as new future players. Change will only come if players choose to change.