I agree. ATRs could operate on routes such as Copenhagen, Cologne, Rotterdam but I suspect that flights to Malta, Corfu, Heraklion, Nice etc. have a greater chance of success. Having said that, I wouldn't have guessed that ATR flights to Rennes from SEN would have proved as successful as they have. It would be good to know the proportion of French nationals on those Rennes rotations.
At the moment Stobart must be searching for jetliners to lease.