Whilst I understand that you are right; the ghost of airfields past scattered around the country with livestock overnighting in the remains of former squadron buildings is testiment to that not being applicable in all cases. Valley was an expansion era airfield and may well have land that is held under the caveat of leaving as was. Reality though is that it would not be destined for an industrial estate or farmland whilst the tourism industry could make it into a goldmine. Even in these days of economic gloom the Mess would be a hotel quicker then you could say "I stayed there once".