I don't know what they gain by firing him now. If FSU canned Norvell, at least they have Gus who can be interim HC. Who at UF could step in that isn't even worse than Billy?
If I'm the AD, Billy can keep getting his brains caved in until I've done all of my back channeling, planning, fundraising, etc in the background. I'm not firing him until I'm ready to make moves publicly out in the open.
I think I'd fire him the week before Thanksgiving, interim gets 1 game, exit interviews/clean house the Monday after FSU.