I have watched this unfold since the beginning and the AMA has not been able to make progress while it still hangs on to the idea of forcing the FAA's hand. I believe the FAA like Transport Canada will eventually simply lump all remote piloted vehicles into one and make up one set of rules for everyone like our part IX of the Canadian Aviation Regulations.
Scroll down to part IX https://lois-laws.justice.gc.ca/eng/....html#s-900.01

Once something like this comes into effect then the AMA will be able to apply for an exemption for its members ONLY, just like we have done in Canada with MAAC. A PDF of the exemption is included