I think he will probably have a hard time being taken seriously as a manager in the English leagues now, but in other countries, who knows.
I don't think so. He has turned around a struggling League 1 club into a championship force. At the very least there'll be interested Championship clubs, at best a lower league premier team, who are taken by his footballing philosophy.
Success is everything for most Chairman, so his ego and at times questionable approach will quickly be forgotten.