I'd like to hope Blue Air. They don't really bring much to Luton. I think they'd be more valued back at Stansted.
Wizz will operate up to 3 departures a day to Bucharest from Luton, hardly compares to Blue Air's 5 per week or whatever it is.
Gatwick has to be the big focus for attracting airlines to switch airports. Possibly could be a number of other airlines there where a move to Stansted shouldn't be ruled out.