But that is because the answer hasn't arrived yet!
It won't be until either it is sold for development, or that it is obviously a roaring success that people will be able to say "I told you so"
Obviously that day has been predicted as coming soon on many different occasions.
One would suggest that that day remains just as far away at present as whilst the credit crisis makes running the airport potentially a less viable option it also reduces the viability of a redevelopment!