The number of people who just take state regulatory enforcement action as something that's good by default is much larger than the number of people who give unions the same benefit of the doubt so we'll probably see geofencing tied to professional licenses at the state level before we see it on the facility/jobsite level and tied to unions.

Large equipment in industries that can afford it is already activated by employee badge for QC and employee tracking purposes so what you're describing already exists in some settings.