The motorcycle market is approximately 1/30 the volume (in terms dollars even less) of the automobile market.
I remember Mission Motorcycles came up with a Model S equivalent motorcycle(electric, high end). Looks like they shut down late last year - http://www.autoblog.com/2015/09/14/mission-motorcycles-power.... Not surprising considering the expected price(30k-55k)
On an unrelated note, electric bicycles are quite popular in many parts of the world.