I had that same idea in my head but the fact that Japan has many PS2 players also should encourage SE to support PS3 backwards computability since you can download FFXI anyway! There's many reasons why some servers should be different to accumulate players to their preference.

For instance: A server for those players who want or like the old style Vana diel and everything is still hard.

I have my FFXI installed on my PS3 already, the same one I bought in 2006. Many reason SE doesn't do the things that they should've but don't is beyond me.