Hmm, I got an idea for an extension. Just tell me if it'd feasible or not.
The currently terminates at New Lots Ave. And one of the biggest complaints around this forum is that the doesn't connect good enough with IRT lines, why not build a new platform at Euclid Ave (it really only needs to be one side platform, actually) and have the terminate there? It would make for an easy transfer to the , all on one fare of course. The and will still terminate at New Lots on their special trips.
(additionally, a new stop could be added to the at Sutter Ave)