i think One Game world, with continents spilt into EU,NA,Oceanic is a fantasic solution. Gets all/most of the Pro's of single server solution and can allow for more competetive PvP (just need to fight in your own continent). You can still explore the other continents and have some 'temporary' lag while you are there, but given you can always go back to your local continent, and have great ping makes the game so much more marketable and appealing.
It seems like the fairest solution - I know people on the fence or outright not ready to buy and sub for a game server located in EU.
Populations might vary from continent to contient, but nothing is stopping you from travelling across, except some ping.
Not spliting the continients to EU,NA,OCE servers seems like a big F-you to anyone that doesnt live in EU.
I think the Devs should strongly consider announcing (and following through) that continents will be region-split.
Or failing that, opening new servers(all continents each on their own NA,EU,OCE server), allowing transfers, with potential to merge them all back to EU when the population dies. Currently the population can't even fit on the one server and this also seems like a feesible solution for the current time being.
Either option has to be better than the current situation (only 1 EU server).