This is starting to feel like when BA took over Dan Air and moved the single LHR INV route to LGW, when Manx Airlines were acquired and the IOM LHR was moved to LGW, when JER lost its long standing LHR link (excluding the short lived bmi return to the route). There is a long enough list of shifts from LHR to LGW. If routes like NQY do not generate significant transfer traffic, and clearly the demand exists, I wouldnt be surprised if routes like these are moved to other London airports. No disrespect to NQY.
The current changes at LGW around charges and more significantly the suggestion that a reasonably big operator may up sticks, shows that growth in the future in the London market will be from STN, LTN, LCY and SEN...