Wade is one of those coaches that does enough to stick around but can never win a championship, or even get close. It's possible to do worse than Wade, but there are a lot better coaches out there.
Of course there's other things to consider than just should Wade go or stay. For instance, who would take his place? The primary and probable candidate would be Garrett. Is Garrett really that much better? Then again, Garrett does seem to be the heir apparent so if we bring Wade back for one or two more years, I can't see him getting us to a Super Bowl. So all it would do is delay the inevitable, which would be hiring Garrett.
While I don't want Garrett as our next HC, if it is going to happen then I'd rather get it over with sooner rather than later. I really see no reason to stick with Wade another season or two and then replace him with Garrett. Might as well get a head start on the Garrett era so then we can definitively see what he can or can't do and if he in fact isn't the answer then move on as soon as possible. Frankly, I would've preferred that to have happened this past year.
I've said from the start that Wade is capable of having winning records and getting teams to the playoffs. But beyond that, he's never won a playoff game and even if he does get one, do you really expect him to get 3 or 4 playoff wins in the same season? Really? If not, then let's move on to someone who can.