This is a very important and potentially contentious topic and I hope we can get organized (both from users and companies like FM) to lobby the proper place for this fantastic device.
Often times, when a disruptive new technology comes out, it goes against or conflicts against existing legislation.
Some jurisdictions define a motorized vehicle by the top speed it can maintain (eg: 25 mph) which one could argue the OW fits below that threshold. You have to look at all the rules and regulations yourself and it would be even better if one of our users happens to be a lawyer.
The ADA (Disabilities Act) also define what access should be granted and luckily it is wide-sweeping but most of us as individuals are not considered disabled. However, many may fall into this category (neuropathies, diabetes, arthritis, etc) so there is hope there. But for the general population, I certainly hope we keep an eye and create some appropriate laws that support its use on public lands.
For now, we fall into some cracks in the bylaws where I live. If the park says no motorized vehicles - I suggest that the OW is not a vehicle and that the OW does not exceed the speed definition. I have also seen some boardwalk trails and the signage says "no bicycles". I see the poor cyclists dismount and walk their bikes as I saunter by since my OW is not a bike...
It would be a step backwards if they ban OW's like they do skateboards and confine those users to skate parks (that would be so boring for a OW) but I believe that was done because skate boarders posed a health risk to pedestrians around them as they tried their tricks and such. So long as OWheelers act responsibly especially around pedestrians, we stand a good chance of surviving this legislation transition.