Would like to get my opp out of the way: not entirely sure why people are complaining. You will NOT lose friends. Simply tell the people you play with what server you plan on going to, and see if they follow you over. Simple. Friendships will be tested. Linkshells will be destroyed and formed again. Fun! More recruiting etc.
On a side note, can we designate which server will be RP / non-RP. I planned on leaving Besaid for some time now. o.O Not from a distaste for RP, but rather due to the fact that I just don't take partake in it.
If 10 is FR/EU, I'd suggest WORLD 9 for RP.