This plays too much into "if the Seahawks just did 'this' they'd win Super Bowls!". The reality is, they most likely won't, no matter what. Even with the greatest QB/coach combo of all time, the Patriots still didn't win that many. They went nearly 10 years between Super Bowl wins. Six out of 19 seaons with the best run of all time? It's hard.
If you get rid of Pete Carroll or Russell Wilson, you are more likely to be in a general team funk or QB hell for many years. The Bears are still looking for a good QB that will be good from year to year, they haven't had one since Sid Luckman. If you don't know how long ago that was, Luckman's last year for Chicago was three years before Dwight Eisenhower was President. And Eisenhower died the same year as the first US moon landing. When they've had everything else going for them the QB position has absolutely screwed them when it mattered.
The Seahawks are positioned to make a good run if things line up properly. Carroll has is negatives, and so does Wilson (including the cost of carrying a non-rookie good QB salary; even if you go to the lower cost guys you only save about $10 million). But we've seen a good QB absolutely waste away in Detroit because they can't get other things lined up, we've seen teams like Jacksonville field absolutely insane teams except for the QB position, and it's constant misery and burnout.
I'll take the Carroll/Wilson setup as it is now, because they are a competitive team and actually have a shot at a SB if things line up. The options I don't like are the high-risk massive change where the team just has to get absolutely lucky not to suck (new innovative coach!, "just draft a good rookie QB!"). We have much better chance of being perpetually miserable for years (or even decades) like most teams than we do of this team winning another SB with those changes.
I'll take the competitive Carroll/Wilson situation with the negatives. Maybe I'm just too damaged from watching this team not win a playoff game for two decades, going a decade without being in one, and just having every season be a "maybe if these other teams do this the Seahawks could get a Wild Card" disappointment.