I can't imagine this passing, but I'm in favor.
When I grew up in Tennessee the drinking age was 21. Nevertheless we really didn't have much trouble getting our hands on alcohol. Now I have 4 kids. Our oldest is nineteen and as far as I can tell he never had much trouble getting his hands on alcohol, either. They were actually - at least most of the time - more responsible than we were in high school. They usually had designated drivers.
Of course, that's beside the point. The fact is that I think the drinking age should be lower - lower even than 18, for that matter, and the bill has a provision for 16 year-old's accompanied by their parents (curious about enforcement of parents bit). This makes sense to me.
While they're at it maybe they can raise the legal limit back to 1.0 and quit pandering to the neo-prohibitionists.