Personally, I feel that all the existing worlds are far, far too empty as they are. I believe opening another world "would" siphon off some coaches from the pre-existing world as those coaches would feel the lure of the race to D1 and the elite schools. Then, in about 15-18 months, when the same coaches who are at the elites now would be at the elites in this new world, we'd be hearing calls for opening another world as "all the elites are filled and there are never any openings". Wash, rinse, repeat. Sure, there would be a couple of new faces at a few of the elite schools but by and large, the same coaches that are at the elites now would win the race to the elites in a new world. That's just the reality of it.
The existing worlds are way too empty as they are. I'd be far more agreeable to CONTRACTION of worlds, not EXPANSION. Adding new worlds would dilute what little competition there is even more.