In my opinion, when this free transfer process ends, we'll be left with 10 servers worldwide: all the servers that are set as destination servers today. They will increase those servers population caps, and congregate everyone there. It actually makes sense, according to the talk about mega servers (one server per type -pvp, pve, rp, etc - and language/location).
EDIT: Forgot about RP servers (probably, we'll have one of each as well).