As has happened at NWI...
The airport has to be sure that the routes will be sustainable for future profits and they would need high pax levels to gain revenue from elsewhere.
I am in no doubt more services will be added in time, links to London are being sought after, but HUY just isnt suited for significant lowcost operations and wont be for the forseeable future....
Best thing to do, play to their strengths and grow the charter side, more winter flights etc...