Pete Carrol has forgotten more about football than most coaches know. He let Wilson go. He looks pretty smart right now.
Wilson will be 35 next year. He could still play another 4-5 years given how QBs are coddled, but then again, a big part of his game is extending plays, scrambling and running. Those skills don't usually age well into your late 30s. I have seen a number of games this year, and from what I can see, the problem is consistency and talent around him. His coach also sucked. A new coach might squeeze some life out of him, but they have no high draft picks the next two years because of the trade, so no young help ius coming on the line or WR room.
I don't see any head coach moving Denver past the Chiefs or Chargers in the next few years, so other than the money, I don't see a ton of upside to Denver's job.