I get the impression that STN wouldn't be too disappointed about not getting La Compagnie. I would imagine their ambition is to get long-haul flights that are more mainstream.
Also their priority at the moment is the Terminal redevelopment, MAG have said they don't expect getting long-haul (other than the few TCX flights this summer) until at least 2016. Makes perfect sense really, why would a long-haul or full-service carrier want to come in before the facilities designed for them are completed?