No. 2 - Jim Harbaugh should replace Pete Carroll
This might be the one coach I have on this list that is extremely divisive. Harbaugh used to coach the rival San Francisco 49ers then went to coach at the University of Michigan, and certainly has had his rules violations issue. But Harbaugh knows how to coach football. In fact, that ability runs in his family as Jim's brother, John, has been greatly successful with the Baltimore Ravens since 2008.
Harbaugh has been a winner no matter where he is coached. Maybe he isn't as cuddly as Pete Carroll, but Harbaugh will lead the Seahawks to a lot of victories. He has playoff experience in the NFL and has shown at the pro level and in college that he knows how to adapt while also finding a way to have successful offenses with different styles of quarterback.
No. 3 - Dave Canales could be Seahawks next head coach
12s will know Canales well as he spent 13 years with the Seahawks organization before leaving to become the Tampa Bay Buccaneers offensive coordinator. Canales immediately showed Bucs fans what 12s already knew: Canales is a good offensive football coach. No one expected the Buccaneers to do much of anything this season and Canales got Tampa Bay into a top-half-of-the-league offense and made Baker Mayfield into an efficient and productive quarterback.
If Pete Carroll decides to step down and be the Vice President of Football Operations only, he would likely have a say in who Seattle's next head coach is. Clearly, Canales and Carroll would be familair with each other having worked together for over a decade. Canales would be one of the easier transitions from Carroll to another head coach of anyone in the NFL.