I think the cross-divisional games will be dead in three years.
Bama-UT and Georgia-Auburn are really the only ones anyone cares about and they have become so one sided in the last few years that there won't be enough to save them when everyone else wants the change.
I'm not so sure "everyone else" wants the change. I believe Ole Miss-Vandy, Kentucky-Mississippi State and soon to be starting Arkansas-Missouri, are all content with the one permanent rival.