As sad as it is to see former RAF stations go, one does have to be pragmatic. Its location served the purpose in the war years, and did so admirably even into the 90s.
As a commercial airport location, it's just not in the right location. The local catchment area is too underpopulated. Bringing folk in from elsewhere needs to be quick and convenient if it is to succeed. Ramsgate is not the center of that particular universe. The investment required to make it more attractive to a wider catchment area is better invested elsewhere.
If it didn't have a future with the RAF, and can't stand on its own in the commercial world, the future is inevitable.
Sad to see the history go, but everything has its price.