4500 homes... That's at least 9,000 more cars because the aerodrome isn't particularly close to public transport.
You then will have at least around 10,000 more people in the supermarket queues etc... You'd need to build new roads, new supermarkets, new schools, new sewage plants... It'll be a mess!
Also - at Redhill, there are no planes flying at night (between say 10pm and 7am) - however, if you have 9,000 more cars, chances are that at least some will be driving at night, causing much more noise pollution than the few planes flying on a nice day!
Perhaps logic isn't something that should be dabbled with people who are so focussed on the wrong solution to a slight nuisance on the odd flyable day (which they should have known about before moving there as the aerodrome has been there for decades!)
I wonder if they would be able to build some houses closer to the runway with proper sound insulation so as to make the land owners happy with rent coming in, and boosting recurring profits whilst still retaining the airfield? Most working families aren't home during the day, so operational noise would only affect the weekends really. Just have a clause in the rent stating that operational noise from the airfield is to be expected, but due to triple glazing sound inside the properties would be kept to an absolute minimum!