The facts speak for themselves.
The number of passenger routes are declining year on year. No new routes (barring one or two from Thomas Cook) are being added. Airlines are not interested in operating from DSA. Link road or no link road, it isn't going to make a difference.
How can a passenger airport survive when on some days there will be one departure? It can't.
If anyone can suggest how or when this situation will change then go ahead, but the facts speak for themselves.