Well said NorthOfRiver & gary4444, I quite agree.
It goes to show how the market is HUY is finite with little or no inbound potential. This is sad for the airport - but makes sense. The airport is heavily dependant on outbound travel - people wishing to leave the area for whatever reason. That alone cannot justify a low-cost network. The airport did its utmost to promote the service -but that holds little power when the demand just isn't there.
People also forget that fares offered by FR on this route were at rock bottom and only managed to attract 5,000 pax per month. The average fare if Jet2 or Aer Arann came on the route will be much higher - thus restricting demand. Unless an aircraft has the same seat cost as the B737-800, the demand will not be the same with a simple switch of aircraft type.