So first off, let us not concern ourselves with the giant world of WoRPA but rather start small and work on a continent of it.
We should have some territories, as for kingdoms, I'm feeling that firstly, there will be maybe three neutral places of interest where all players can go. One can be a castle, another be a modern day NYC, and then a futuristic utopia.
As for player controlled kingdoms, this will be limited. What seems best to me is having the ability to create a kingdom as long as you have a willing party of 4.
A king(s) is chosen amongst the 4 and when we create a map for the area, it will be placed somewhere there.
How territory is taken, is another thing as well as the benefits that lie in it. However, when it comes to taking a enemy castle, there could be various choices we can expand on later.
For those who aren't part of a player controlled kingdom can obviously be from one of the neutral kingdoms or just some random place that really doesn't infringe on the map much at all.