Start with this: Is this idea realizable? At all? Even close?

What you say is, i want to do a MASSIVE multiplayer game (all players on same server) where you can do ANYTHING you want on a world BIGGER than anything ever produced.

So you want to do EVE online and WOW combined, just better and bigger. Do you have tens of millions $$$ and a huge staff of professionals that will work fulltime for many many years? If not, just come up with another idea.

The "idea" just seems to be EVERYTHING. Sorry for sounding harsh, but its actually rather silly.