Has anyone actually modeled the PWR in a BTHC scenario? Is it obvious that any six hockey teams, that play, what, five games each against each other (They gotta play 25ish games, right?) will have an overwhelming advantage in the PWR? Is it obvious that four of them will get in the tournament? And when we're talking Michigan, Michigan State, Minnesota and Wisconsin, isn't that fairly common anyway?
And if it expands - how frightened are we really of Northwestern, Purdue or Illinois? Nebraska hockey would blow, but that's for intrastate reasons of little interest to this board.
All of this by way of saying: It's not obvious to me that BTHC is apocalyptic, or even material, in terms of the NCAA or anything else from a math perspective. Nor is it obvious that hockey players will stop going to schools outside the Big 10.