One of the cities in AUS just legalized sharing. (I forget which one) We need studies from their experiences to show its not a dangerous thing to do. If we're lucky, it'll show that its actually better for traffic in a few ways.
AFA getting sharing accepted: massive PR campaign from ABATE and the AMA as well as a concerted effort from local groups pestering their representatives in the state govt.
IOW I don't see it happening any time soon because both the AMA and ABATE are both too concerned with anti-helmet laws and could care less about using MCs as transportation.
I'm a cyclist that rides motos, not a moto rider that rides bicycles.