Talking of Thomson Airways in general from Luton, I do wonder if the airline is struggling with its base from the airport?
You only have to look at the supplements Thomson often charge for flying anywhere other than Gatwick to see why the airline can appear to struggle at Luton except all the flights I have taken with them over the years have still been near full if not completely full.
The problem for Thomson at Gatwick is that Gatwick likes the year round airlines that pump passengers into the airport during the lean winter months. It must get to the point where they will find it hard to get summer only slots when the airport can sell year round slots to the scheduled airlines. When that happens maybe Luton will pick up some extra business.