Unfortunately, it seems Boeing shot itself in the foot with the 717 decision. It is an excellent plane. Well designed, well built for a long service life, good performance, quiet, comfortable, excellent fuel economy, etc. However, the airframe doesn't lend itself to being shrunk down to say a 70-80 seat size and Boeing refused to consider stretching it for fear of stepping on the 737 family. Thus, there was no 717 family of aicraft and it had to fit a specific niche all by itself.
Carriers that have the 717 seem to love it. As I understand it, AirTran begged for a longer range 717 so it could fly transcon and maintain fleet commonality. Apparently, they went so far as to threaten to transition out of the 717 and go all Airbus when Boeing said no to creating a 717 family. Ultimately, of course, Boeing was able to convince AirTran to add the 737 to their fleet at a significant discount.
It's a shame. If Boeing had addressed these issues for AirTran, there probably would have been a bigger market for this plane with other carriers and Boeing may have managed to keep a big slice of the market that Embraer now enjoys.