Having worked for the (old) Brymon at PLH during the 1980's I agree that if an airport is to succeed then it needs to be relocated.
As I recall the secondary runway was 12/30, they realigned it to 13/31 to get as much length as possible so where exactly might a runway extension now come from, unless they are to landfill, reroute roads and/or knock down houses?
It is also located on top of a hill, I recall one February when for an entire month we didn't see an aircraft whilst the cloud remained on the surface, it needs to be relocated nearer to sea level and with a decent length of runway.