Depends on how the Seahawks finish the season.
Broadcasters seemed to love to talk about Bevell and his future as a head coach last year, I don't hear that as frequently despite his play calling being just as mediocre. If the Seahawks finish the season with another Superbowl run, you can expect that he may have head coaching gigs knocking at his door.
Tom Cable on the other hand I'm not sure. I don't think he gets replaced, the poor play during Carroll's regime by the offensive line is not completely on him. From day 1, Cable has had garbage talent to work with on the offensive line. I know that there are a significant amount of Seahawk fans who like James Carpenter (which I cannot even fathom), but he is trash and has shown up to camp at least 2 years 20+lbs overweight. I think he showed up in relatively decent shape this offseason (it's his contract year, big surprise), but he is mediocre at best.
Aside from Unger and Okung, Cable has had absolutely zero talent to work with. The only thing I'd penalize him for are the penalties. But that has been characteristic of Pete Carroll teams.
The reason he has zero talent to work with is because Cable hand selected the players on the OL, except for Okung and Unger. Which tells me he should not be part of evaluating Ol for the draft. The man is his own worse enemy, he keeps drafting maulers who can't pass block.