I get the feeling Rivet Joint likes flying out of Southampton on a daily basis. And to add to your list, home of the Ford Transit...no wait! (sorry couldn't resist)
Not that RJ has anything against Bournemouth but his information is simply wrong. I wouldn't put a housing development on it, gravel extraction maybe... (sorry couldn't resist again)
I am a bit concerned that this thread is getting into a Southampton V Bournemouth contest, yet again. Both airports co-exist simply because they attract different times of market generally, with both airports dabbling in each others markets but not succeeding enough to affect the other. Only time will tell, and to be honest, long may both airports exist and prosper for the sake of the livelihoods of the people who work there.
Rationalists would argue that only one airport should exist but both airports have physical attributes that would make the decision difficult without serious cost to infrastructure and peoples lives.
Vive la difference!