According to CAA website 7563 passengers used the BFS-AMS service in May - up from 7404 a year ago. 122 per flight with a load factor of 83 per cent.
Rem when it was three a day with KLM (Fokker 100) it was pulled presumably because it was loss making. Unlikely that KLM would ever look at it again. Ezy did have two a day for a year or so but the mkt obviosuly couldn't sustain it.
One a day looks about right and with decent (inceasing) loads it looks pretty safe - you might even say buoyant. Oh... and BFS-CDG looks sound too with 80 per cent plus loads (7499 passengers in May).