Any way, I fully agree with OverEasy's point:
"Don't we already have unlicensed open carry for rifles and shotguns? Nobody is training these people or screening them.
I agree that certain people have no business carrying a loaded gun... or driving a car etc. But restricting everybody in order to prevent some possible future problem?
Let's just make everything out of nerf."
[bad attempt at a little levity]
That doesn't mean I would walk down Congress in Austin with my shotgun under my arm at lunchtime.
No doubt Austin's Finest would descend on me in short order. 
I don't think they would take kindly to my explanation that I was there to help thin out the grackle population. But at least I would get my own padded room if I told them that. 
[/bad attempt at a little levity]