@celti There are lots of aircraft we would like to develop and we'd be lying if we said we had never considered any of the aircraft you have listed. The difficulty we always face from a commercial perspective is, how popular are these aircraft types are outside of their country of manufacture? For instance, how many people outside of France have ever seen a Mercure in person, or even have ever heard of one? If people aren't aware of the real aircraft's existence, it's not likely to be as successful commercially as a more well-known type.
Never say never on any of these though, we are always in the market for niche, quirky airliners ;)
Mark - Just Flight