Large streaming open-world game?

[webnetweaver]

What is the best way to go about creating a large streaming world environment?

Is it advised to have everything in the same world and use Switcher node to activate and deactivate nodes?  Is it advised to use separate areas into different worlds and load mutiple worlds additively using AddWorld()?  Also, if a world is loaded using AddWorld() can that individual world be removed later?  How to go about a streaming world?