As for possible replacements for Pete Carroll? I expect the names of Lane Kiffin and Steve Sarkisian to be brought up as well as the usual suspects: Terry Bowden, Tommy Tuberville, Phil Fulmer
I could see names such as Chris Peterson, Kirk Ferentz, Gary Patterson, Lane Kiffin and Steve Sarkisian come up at USC. Also like for the usual suspects: Tommy Tuberville (if he does not get the Texas Tech job) and Phil Fulmer.
If I was USC, Chris Peterson would be MY number one choice. I don't think it will happen, mainly because I think Peterson likes being in Boise. He could have made a lot more money somewhere else if he wanted to, but he choose to sign a new five year contract just a few weeks ago. I think this is a man who is content with the money he is making and loves being where he is. Boise is a passion to him, not a launching pad.
Looking at the Pete Carroll coaching tree, Kiffin and Sarkisian are the two obvious names. If I was USC, Sarkisian would be my 1b to Peterson's 1a. You would have the perfect heir apparent to Carroll who now had a good (not great) year at Washington.
What's very interesting is that Jake Locker has announced he would not leave for the NFL this year. A big part of that was Steve Sarkisian. If Carroll does leave for Seattle, it will take some time (they have to interview a minority coach). Then, once Carroll is gone, the USC head coaching search will take sometime. If Sarkisian decides to leave Washington for USC after January 15th, Jake Locker will not be able to enter the NFL draft.
I don't think Kiffin will leave Tennessee, but it's certainly possible. I am not sure USC would want Kiffin though. Unlike Tennessee (who spent the decade as the third wheel in the SEC East with lagging recruiting) they don't need the circus Kiffin has (masterfully) orchestrated in Knoxville.
The Dark Horse from the Pete Carroll coaching tree is Nick Holt. He was LB's coach for Carroll 01-03, he went on to be Head Coach for Idaho (5-18 in two years), decided to leave Idaho after being offered a position with the St. Louis Rams as DL Coach but before signing a contract, the Rams were outbid by Pete Carroll. He was USC's defensive coordinator before last year when Sarkisian gave him a raise to fill the same role at Washington. I don't think Holt is a big enough profile to fill Carroll's shoes - but if USC wants to maintain consistency after Carroll, he could be an option.
Outside of the Carroll coaching tree, Tuberville is good enough to coach USC - but I don't know if he has the personality to mesh well with the culture over there.
I don't think Fulmer is a good fit there either (I would kinda be surprised if he coached anywhere after Tennessee) and Tommy Bowden isn't qualified to write a letter to USC about the job.
Kirk Ferentz would be a VERY interesting choice. He has routinely been a college coach mentioned for an NFL job, his Orange Bowl win certainly helps him. I think he would be a good fit.
John Fox is another coach I think could work for USC. He only has one year left in Carolina and his future is very shaky there.
Looking at other NFL coaches with questionable futures, Jack Del Rio is a former USC star. I am sure the Jaguars would LOVE a chance to get rid of Del Rio without having to pay him 15 million dollars. He is a quality coach in a bad situation who out performed his talent in 2009. If I was USC, he would be high on my list.