Looking forward, South Carolina’s loss changes South Carolina’s bowl calculus, to a degree.
Assuming quality matters (not always a safe bet), USC would safely rank behind Georgia, Kentucky (even after the Tennessee loss), Florida, Alabama, LSU in the SEC. The Gamecocks are ahead of Vandy, Tennessee, Ole Miss and Arkansas, the latter two out of the bowl picture.
Mississippi State will likely get to 8-4, barring an upset. Unless Texas A&M knocks off LSU or something shocking happens with Auburn, the Gamecocks will now be bunched with the Aggies and Missouri (again assuming no weird upsets), instead of with the Bulldogs.