Without overly mentioning the big "C" word ! If the airport is losing money as bad as they say, then the council would have no option to close.
I am an avid supporter of the airport (something to do with i work with it a lot) and would hate to see it close. Yes i think putting it under the umbrella of HIA would be a good idea as they have the experience of attracting new routes.
Dundee will as everyone says be never like glasgow or edinburgh, but it could become an important regional airport with only a few more routes. Business traffic is through the roof with the bulk of operators now using dundee instead of leuchars so it does stand a good chance of survival.