You might want to narrow the audience if you keep getting feature requests. Make the product awesome for one of those groups you talked to and then grow from there.
That’s basically what we’ve been attempting. We tried to target just one user group at a time, but everyone seemed to have their own different vision of what this should be. At this point we don’t feel too confident with spending several more months developing targeted features for someone, only to find out it was all in vain.