fly20,
The likes of NCE, BCN and AMS are destinations already served ex BRS. Flybe have demonstrated that they are committed to the regions in the UK and the same is apparent in France. Not everyone wants the big city destinations.
Flybe is catering primarily for repeat business and for UK travellers heading to France this means taking them to the regions where they have their second homes, places like Limoges, Bergerac, Brest etc. The added benefit is that for those that have already made the move out to France you pick up the VFR (visiting friends/relations) traffic heading out to see them.
This type of destination creates the repeat business that all airlines need and not the type of travellers that will necessarily just nip off for a weekend break. It is also well within the reach of the Q400 which is ideal for this sort of route.
Flybe have said countless times that they are not out to compete directly with FR or EZY. With this being the case, why fly to the same places making it look like you are?
Just for the record....Flybe are not getting anymore 146's! Not sure where that came from. They are getting rid of them prior to the new EMB's coming in. Why get more!