Struggle?
I guess it really depends on(assuming it did happen) the number of a/c and routes they wanted to base at BLK. It is only a small apron at present(rumours are for it to be extended) but you can get a couple of 737s in at once. With BLK having so much time during a given day(apron space) I'm sure any operator would be able to put an a/c on the ground when they wanted to. Even base an a/c at BLK with no problems. As the development of new operators and based a/c increases so will the size of the airport in my opinion.
The terminal is small but can handle a lot more pax than what it is doing at the moment. Again its back to the spare time the airport has everyday. If no a/c on the ground then no pax in the terminal so they wouldn't have a problem. These issues will only become a problem following a significant increase in pax and a/c using BLK.
I had a look on Flight International and couldn't find any reference to BLK/thomsonfly. Maybe it was not significant enough to put online.