First, Cut isn't likely to want to come try to rescue TN. He's under little pressure at Duke and he's in the twilight of his career.
Second, Arch Manning isn't coming to "rescue" a program either....... Ole Miss OR Tennessee. I understand "family tradition" but if Ole Miss and TN look like something you hose outta the back of the milking barn, Manning could easily go to Clemson or Bama and be instantly in the hunt for a Championship.
At Bama or Clemson he'd be incredibly well developed for the next level, he'd play behind an NFL quality O-Line, and the HC would be rock solid in their job. It's 100% sure TN can't offer that and iffy if Ole Miss can offer that.