Just split it already - rip the band aid off - it's always easier that way.
IMHO, when it does split, the idea that the upper level is going to contain 50+ teams is, IMHO, silly. This is driven by $$$$'s, and the networks/conference don't want more Wake Forest's, Vandy's, and Purdue's.
You're going to have maybe 30......ala the NFL. The rest is going to coalesce into something new. If anyone in the G5 had a brain bigger than their ego, they'd be making these moves already.
I feel like we're all on the Titanic, and there's a perfectly good lifeboat to our left, but we're staying on the sinking ship as long as possible on the slim to none chance there's a spot available in the first class lifeboat.