Cornishsimon is spot on, as another Cornish ratepayer I have to say that the jobs created and the income provided by these additional activities are far more important than any 'potential' from a larger air network.
Of course air routes must be maintained but further development will always be severely restricted until more industry is located in the area to provide the passengers.
Its the age old story you need the passengers before you need the flashy planes and glamorous airport buildings.