If I'm not mistaken, I think Lanning has close to a $15m buyout this year, and around $10m next year. On top of that, they'd have to buyout Harsin, and aren't they still buying out 1-2 past coaches? I know there's a lot of money down south, but even they have their limits.
When you have the chance to hire a coach who's marque win is a nail biter against a the Coug you throw cost out the window. Vaguely Southern Sark won't stick around.