There was a "Boeing Dash 8" for some time, too. Didn't really stick....
I also think that the E2 is not suitable for much stretching, even though the 2+2 seating is nicer for the Pax than 2+3.
Don't know about the E2 but the classic E-Jets don't have spectacular runway performance either, don't think they can go everywhere a 737 can go.