LeeBakerStreet
If you honestly believe that Luton has an equal balance of operators then you really need to look at the departure boards at your favourite airport...
Wizz
Wizz
Easy
Wizz
Wizz
Easy
Wizz ...
I could go on.
It's no less dependent on Wizz and Easy than MAG is with Ryanair.
It could also be said that the dependence on FR up the road at STN is less this year with 14 scheduled airlines plus quite a large charter presence in comparison to LTN.
Your opinion is a bit dated if you ask me. I think all SE airports are heavily reliant on at least one or two dominant carriers.