"The question for the rebels is, what do they decide to do with it?"

I don't understand this type of question about it. Unless the current allegations will, by themselves, result in the death penalty, the NCAA has every incentive to keep investigating and tacking on additional penalty-causing allegations when they find more evidence. Failing to do so tells other schools that there is a upper limit to how far the NCAA is willing to go, and so continuing to cheat during an investigation has a predictable and capped/limited risk.