I think that just about all of us that have enjoyed a warm/sunny day in Dolores Park can attest, there is plenty of drinking going on in the park. Will there be an end to it altogether? This seems extremely doubtful but you never know.
According to the article you posted there have been people bringing in kegs. I have never personally seen that but I'm sure it happens. I, for one, am completely okay with people drinking in the park if they handle themselves and don't become a nuisance to others. I do not condone under-age drinking or the reports of heroin use, etc but think that responsible drinking is okay.