While I agree with you, getting motorized recreation users banded together, and I mean OHV, motorcycle, gold mining, and anyone else that uses motorized anything on public and state land is like trying to herd canarys with cats, and keep them both in line.
We tried here in Oregon many years ago to get all types of users into one group to be heard. We included all motorized as well as mountain bike and horses. It went nowhere, because all of them said the same thing, they aren't after my recreation, only yours.
I really have my doubts that any kind of organization will be formed to fight it and other closures except by the small body directly affected at the time, so there are not enough voices hollering to make any change for our side. It is just like trying to change congress, everyone likes their person and keeps sending it back, it is the rest of the idiots that are the problem, so they all end up going back for the most part........I've been doing this since 1976 and am getting tired and old, and not making any headway.