Well, this.
No point me talking about things you can't change - there's nothing much anyone can do about Ashley (until he sells up). But there's still things a manager could do. I suppose the question is, do you see progress under Benitez? Is he developing the youth team or the infrastructure long term if he's not willing to give the current youngsters a go. Is there any long term vision. Is he going to turn you into a stable PL club? I agree he was more than capable of getting you out of the Championship, is he good enough to keep you there. I don't like changing managers, but he comes across as someone going through the motions and picking up a paycheck. Put it another way, if Benitez had ambition he'd have walked by now. A young manager cutting his teeth, playing good football and proving successful at a smaller club here or abroad may be a better option.