I’m not sure the airport really needs it - passengers are passengers and short haul shoves more through the shopping at the terminal.
i too am surprised at TC and TUI but I guess if they were profitable then they would have stayed.
i also think narrow body TA service will work, from either Luton or Stansted. It just needs someone with some solid financial backing to allow the initial slow start curve not to bankrupt them. I’d have thought seasonal Orlando and Vegas services would sell, but I wonder if that’s enough to justify the cost of operating at another airport for someone like virgin