Very true. Our recruiting was suffering well before he left (it wasn't bad, but evals and effort suffered when Beamer left), so the decline in his last two years was predictable, especially considering the downgrades at several key assistant positions.
To have the greatest chance to be successful here, I think you need a proven Power 5 head coach with recruiting and coaching ties to the southeastern U.S. generally, and South Carolina specifically. From there, he has to have enough coaching cachet to bring in a staff that is good to great at recruiting in this territory, but perhaps even more important is his chosen staff's ability to evaluate and teach. Programs like ours build with high three-stars and low four-stars, coach them up to compete with schools that have better athletes and depth, which then allows for upward mobility. (We had all of that in the middle of Spurrier's tenure but did not at the beginning and end... his results bear this statement out.)
If you look at Muschamp's tenure here, he has recruited well at certain positions and individuals on the staff have been lauded for their teaching ability, but I think sometimes our evals, especially at offensive skill positions, LB and safety, have been deficient. B-Mac had a great reputation as a recruiter but did little to recruit his position... we've had a number of busts at WR that we're still suffering for it now, and he seemed preoccupied with length rather than hands/athletic ability. The problems with game day coaching have been beaten to death, although sometimes I think we've given too much weight to the Xs and Os rather than Jimmys/Joes.
So who fits the above profile? Because South Carolina traditionally has had little tolerance for past moral or professional indiscretions, you can likely rule out guys like any member of the Briles family, Lane Kiffin (although that ship has sailed in any event) and Hugh Freeze. Urban Meyer is the only name that immediately comes to mind, but he'd probably rather die than debase himself by taking our job. I think we'd ultimately be forced to hire a small school coach or retread Power 5 guy who failed elsewhere given current finances, so effectively another Muschamp who perhaps doesn't have the stink of a full nine mediocre years on his resume. Or you can continue to try to continue to upgrade assistants for another year or two to see if fortunes improve while buyouts continue to drop, and if they don't then go after someone. I am skeptical that T-Rob/Muschamp can run a consistently competent defense because they haven't here yet, but I do think our offense can be good to very good with the current offensive staff, especially if they're around long enough to get Gunner Stockton and some more WR here. Either way, it's not a good situation.