Be they skiing or winter in the sun flights, they make very little money for anyone and operators will only take them on from the larger airports where they know that most flights will be full.
Theres no issue with flights not being full at HUY. When TCX had their outbased B757 for a half a week a couple of years ago load factors were 90%+. Even the January figures were good. What seem to have killed the TCX 'outbase' was the costs of such an operation
I am personally hoping that Tunisia may go year round in winter 2011/12, or at least operate for part of the winter. Thomas Cook are doing Norwich-Tunisia this winter on a w pattern basis, so hopefully they will do the same for HUY next winter, assuming the flights do well next summer