The reason Wizz left is because the funding for the route provided by one of the RDAs dried up, having said that, you'd think if the route was making money it would have continued regardless. Wizz had a fairly big presence in the UK, was MME the only airport in the Country they've abandoned in the last few years?
Also, Flyglobespan have gone into administration, I dunno about you, but I think it's better they left when they did than if they were still here & left because of bankruptcy.