I am most interested in the potential effect this has on motorcycle riders. Not because I ride, but because I have friends that do, and occasionally rant about idiots who think its funny to make a 'run' at them, or an attempt to run them off the road.
I would certainly view any such action as a threat of serious bodily harm. Will this new law make it legal to 'brandish' or otherwise demonstrate armed status, or will it fall under the 'road rage' category?
Personally, if I were riding a motorcycle, (I don't, due to my hearing) and someone attempted to run me off the road, there would be no brandishing involved. That constitutes a clear and present danger of immediate death, not just severe bodily harm. It would be draw weapon, fire repeatedly into engine compartment while opening the throttle all the way. Once a distance of a mile or so is assured, call the cops and report the incident. I think unloading a 9 or larger into an engine compartment is going to disable/stop any vehicle legally on the road. And it keeps the idiot nice and safely alive, if a bit urine soaked, for prosecution - barring an odd ricochet.
More effective, as a deterrent for future idiots, is the media attention such an incident would bring. Reminiscent of those Kalifornia drivers suddenly gaining some freeway manners in the 1980's after a few freeway shootings. An armed society is a polite society kinda thing.
Only one individual can be 100% relied upon to be in your presence at all times and in all places to defend you and your family.