Completely disagree with you As on this one.
In my opinion, if Manure gets anyone other than JM, I wouldn't see them winning the league in the next 5 years. Their squad is poor, they have been outplayed badly at times by us, Cheat$ki, Pool, City, they have however walked the league because they murdered the brick teams and SAF get's an extra 20% out of the players. Outside of JM taking over, I'd expect the league in the next 5 years to go to City and Cheat$ki.
Re Moyes, look at his record in depth, yes keeping Everton in the running is an achievement, but anytime it matters, e.g. In their Derby (their record against Pool is beyond appalling), Their 1 shot at CL, any cup semi or final, always bottle and fail while playing a negative, borderline dirty type of game.
Unlike a lot of people on this board, I'm not a closet Manure/SAF fan, but his ability to get the best out of them cannot be ignored. His moving on at a point where the squad needs major re-investment to continue to compete and/or get results in Europe. I can easily a slow decline for Manure ahead.