Im not doubting their DOF seems decent - but we've seen clubs like Brighton (Swansea, Southampton) have a few decent seasons, sign a few good players then drop like a stone when it dries up.
I wouldn't mind the fella at Everton but the stone cold reality is the likes of Kev The Rat wouldn't stand a 16th placed finish at Everton - Potter and Ashworth would be utter bums in his world and there would be no 2nd season or 2nd chances in his mind and thats the problem.
You have to bring in people capable of reaching the expectation levels of Everton not Brighton.
Difficult to do as our expectations are high - Spurs are doing that now with Conte.