IMHO the Vols go the way Diamond DeShields goes. If she decides to play nice-nice in the sandbox with her teammates, they are a Great Eight team with a chance to beat Notre Dame, Baylor, South Carolina, Texas, FSU...basically anyone else who can reach that round (they'd need a bad game from UConn to beat us). If she slides back to her old ways, TN might be out before the Sweet 16. She's much like Odyssey Sims and Angel McCoughtry, in that her mood and behavior swings will define her and her team as much as her talent will.
It will be a much bigger blow to South Carolina, as they are (currently) the established Beta dog of Women's Basketball. TN isn't in the discussion (yet).