I would use it, when I have business in NQY.
I did LGW-NQY, but it really was DUS-PLH.
Even then, I would have preferred connecting on BA at LHR (rather than U2 through LGW *shudder*)
Now that SZ and PLH are defunct

, NQY would be the next best thing...
I think there may be quite a bit of business for connecting travelers, but I am not sure whether loads would be sufficient overall...