You do realize that ALL RC aircraft are considered UAVs??
UAV means Unmanned Ariel Vehicle, it makes no distinction on power source or method of generating lift.

Government has used the divide an conquer theory since government existed. You start by regulating out the easy targets because to many people will say "As far as I am concerned it has to do with the UAV which I care nothing about." to reduce the number of people that care about something. Once that small segment is gone those people will not care about the rest of the hobby because they are already out of it. The government will nibble away at the easiest targets all the while shrinking the size and strength of the main target.

This is exactly the attitude that the government wants and needs to get rid of everything.
Turbines are also a comparatively small group and could be an early target.