Idea: Different Continents
All one world - Must take actual ship/plane to the continent
This allows for expansion for corporations
The continents could be seen as like a 3rd world country
Each one is a different nation
They even can go to war every now and then opening up a career in each island's military
Each country has its own government, own people, own military, own economy
Trade between the countries could also make an entire world economy
I know this will never happen but hey possibilities are endless *wink wink* maybe a dlc!