So pretty much if my world become JP i'm stuck in a JP world? then 6-12month later we can switch? By then no one not even my linkshell would be willing to switch over to NA without losing loads of players.

Would it not be better to make a few NA,EU,JP worlds that old 1.0 can switch to any of them? which then only level 1 char can log in to the other NA,EU,JP worlds?

Some of us want to join a NA world from day 1 and not wait months.