Yep. That seems to be the goal - at least for NM, which has a lot of independent film production. This is how things change (as they should - no one should die because a real gun is on set, much less real ammo; the alternatives are too many and no one cares about authentic antique guns in Westerns).
Yes, each person (not just actors) who handle firearms in the course of their work should be trained. That includes police, prison guards, security guards and whoever else is handling firearms in the course of their employment. And if they are not, the employer should be held responsible (just as we hold oil companies responsible for their workers when they go to do various dangerous things).
It's already oozed over to other things. It's not okay for an American corporation (say, Enron) to not oversee its operations and its training well enough that...huge oil spills take place. Or explosions (in other industries). This has been going on, as far as I can tell, since the late 19th century (stricter controls on business risking people's lives). Triangle Shirt Factory, etc.
In our day and age, people expect corporations (especially ones that do not perform any central function - such as coal mining - which is highly regulated) to protect their workers.
What do you think the NM Governor's view is on firearms? Were they elected on that platform? I really don't know - and I used to live there. It may entail (notice I didn't say "a plan") removing "real" firearms from sets. Is that a bad thing? If only one life is saved, I think it's a good thing. Real firearms (and blanks) are both unnecessary in modern film making (and so, Rust was itself at the bottom of the barrel - and still is - in terms of potential earnings and distribution).
Shoot em ups are different now. We don't need functional firearms on movie sets in order to be entertained.
IMO. And this has nothing to do with general "gun rights." It has to do with guns in the workplace.