My thoughts (Which have no bearing on actual hiring/firings) are as follows:

-Grisham: WRs have regressed overall. They no longer block, create separation, or show any desire to fight for contested balls. Though we are somewhat limited in physical attributes this year, 2/3 listed above can be taught. I believe the Grisham experiment has run its course and thank him for his time, but someone else needs to opportunity to evaluate, coach, and rebuild the WR corp at Clemson.

-Spiller: The jury was out on Spiller for me until late last year. I believe that he has done a pretty good job overall with the running backs. He has helped Shipley elevate his game (sans pass protection) and learn to navigate/take advantage of the space he is given by the OL. Pass protection is often something that running backs have to heavily work on (even the Great Travis Etienne struggled at times). He also has helped Mafah and Pace (prior to injury) improve their output. The running back corp is one of the strongest units of the Clemson offense this year. I see no reason to fire him.

Streeter: Former QB coach promoted to OC. Unless I am mistaken, he is still in charge of the QBs as well. I believe that his time to move on should have come prior to last years promotion. QB talent under Streeter has not progressed, but regressed under his tutelage. It also appears that whether he is hampered by qb play (once again falls on his coaching), available personnel (unable to formulate scheme to fit talent), a lack of identity, or a combination of the factors. I do not believe he has what it takes to be an OC at this level. There is a reason he was calling plays at Richmond before he joined the Clemson staff.

Other off-season changes that I would like to see are:
1. Hiring of Jeff Scott as recruiting coordinator/WR coach/ assistant HC (make up whatever position necessary). His ability to recruit is worth its weight in gold.
2.) An addition of true LB coach. I believe Wes is going to be a great DC, but some extra fire/firepower is needed to rally the troops. Schematically, I have very few issues with him up until this point. I just believe having additional help to relay the schemes to the players would be beneficial.
3.) Bring in a new OC and QB coach. Thank Streeter for his time, but move on. Though, I believe there is a rift between CCU OC Willie Korn and Clemson, I believe a significant sum of money could convince him to share his young, efficient, and exciting offensive philosophy with us. I do not look forward to seeing the same stale offense for the entirety of next season.