MAN has an amazing diversity of airlines, which makes it one of the most interesting UK airports. Do you really want to replace that with a sea of orange?
As other respondents have pointed out, if EZY built a hub at MAN, it would probably be goodbye to some of the legacy carriers that have used the airport for years, as well as a few of the more recent loco arrivals.
What MAN really needs are more long haul routes, so the airport can be a real alternative to LHR. Frankly I'm amazed that with the recent huge surge in flights to India from LHR, MAN still hasn't got a single direct flight to DEL or BOM.