Features I think would be cool for an MMO

Well WvWvW in GW2 is kiiiiind of like a big game of Domination?
Not quite what you’re suggesting but not too far off either.

But on the upside, it’s getting easier and easier for smaller teams to make games, start figuring out how to implement your ideas (and try them!) and eventually when/if you get a prototype going maybe you can attract some other people to the idea.