Welcome to the forum. This one has been mentioned a couple of times. Nothin has been said over here on the rock thou. The rumours doin the rounds are EMX and BE and whats goin to happen once everythin goes through....but back to the question.
EMX and VLM already serve LCY, and pretty much every month, pax figures are increasing slowly as you can see on the airport website. The advantage for BACF would be that they would use a nice RJ100, and businessmen like a nice shiney jet. If they do come onto the route, that would be 3 operators, which is too many, and someone would have to give.
VLM are changing their times shortly, and adding a sunday rotation. Risk for BACF i think, we will see what happens