I don't understand why it is a concern, many countries allow drinking in public, and yet I've never seen as many intoxicated people in public as when I moved to Canada. All councilors need doing is taking a look at the data in these countries, or even Montreal in here!

The vast majority of people who'd take advantage of this are responsible ones who just wanna share a beer and some chips with friends.
The ones who'd get wasted are already doing it, they don't care about the law.