PF,
During the planning battles, I would love to have seen MOL v WDC, but TOM were much more polite!
Every indication for now is that MOL is happy with BHX. That will probably remain the case, but things can change. What if mgt start thinking they can bring in loads of big long haul routes once the runway extension opens, and they don't keep FR's landing fees low enough? What if MOL goes to renegotiate his fees, saying he'll go elsewhere if he doesn't get his way, and BHX call his bluff?
I don't think either of the above is likely, but stranger things have happened.