I'm not proposing this, but posing a hypothetical.
Hypothetically, I'd probably end up leaving. Dwilight and (kinda) the Far East are RP islands and that's where my two favourite characters are. Forcing everyone into one island will stop the RP atmosphere for those who don't stick to it and I'd be peed off
However, if the RP atmosphere stayed, I think someone would try to conquer the world (Lukon seems like the realm to want that). You probably won't see as many continent-wide federations as you might expect, but probably neighbouring continents would align - e.g. If I can move from Ohnar West to Madina on one route, they'd probably become allies. Wars would be bigger and last longer, probably permanent wars between some blocs.
Overall, I don't think much would change.
