What makes you think that? Dyche has achieve more than Dean Smith, Gerrard, Thomas franks and many of those listed. He did it with a tiny budget, who is to say he can't do more with the resources villa have.
He'd also have a voice and would call out the bollox that goes on behind the scenes at villa.
Were all nervous about the football being poor but target him to bring goals and a style of play. Things that were not possible with the money he had to spend at Burnley.
We all loved Smith because we could identify with him, I see similar in Dyche.