The only chance of creating a "super-division" would be at the DIII level. Maintaining a full world is a lot of work and i just dont see the Rupp thing lasting for the long haul. So if you did a 2-a-day world, i would recommend DIII. But you would still need one (probably a few) owners as a driving force, constantly recruiting new coaches for the world.
Its a great idea, and lots of coaches seem to be on board, i just dont see anyone taking the reigns to maintain it. And thats what it will take for anything like this to last.