Does this open up the Coach to litigation by downtown bar owners for restraint of trade?
You never know...
No more than it would open up the bars for litigation for serving the underage players.
Probably also no more than the number of incidents where they allow patrons to become so intoxicated they can't function correctly or get into fights or say commit a sexual assault. Besides the backlash for such a court case would be way worse than say not allowing 1/4 (seniors old enough to dring) of the team to go into such an establishment. Typically when you find a trouble spot there is a reason. It may be managements philosphy, they types of patrons they cater too, allowing a little of this or a little of that and then someone crosses the line. You can run a clean safe establishment or you can run a meat market it's really your choice.
Besides it's a whole lot better than having a repeat of some of this situations that have arose at those establishments.