I go up to Alice's Restaurant, a major biker hangout in the SF Bay Area, almost every Sunday morning and have tried to discuss electric motorcycles with everyone that I meet up there over the past two years. I have found virtually zero interest in the subject. Once or twice I have been humored with conversations lasting a few minutes, but they were just being nice. Most people would rather kick tires, instead of kicking air.
I think it will stay that way until the bikes finally get on the road and develop some sort of track record. Since on-road models don't exist that can make it up (and back home) to most places like Alice's right now, the only thing that will attract attention are racing exhibitions, particularly if electric motorcycles can race directly against IC motorcycles and start beating them. That will get the attention of many enthusiasts. Unfortunately, I figure that it will be a few years before the technology gets developed enough for this to happen in anything but a short sprint race.
I figure that keeping the subject in the motorcycle press really helps, though.