Luton airport management should be getting worried at this point about how vulnerable they are now to the whims of just two airlines.
Easyjet should be worrying that they will cease to be the airport's sole 800 lb gorilla compared to all the other airlines and will therefore no longer always be the first airline that Luton contacts when asking for opinions from airlines
For those not familiar with the term (and no I am not suggesting Easyjet do anything illegal - just that as the major player they have probably been able to get their way more often than maybe minor airlines)
https://en.wikipedia.org/wiki/800-pound_gorilla