At risk of sounding like even more of an extremist than I actually am, I lay the blame for the 'ecological collapse' of the "gay bar" in my town on straight women, and have no doubt the same thing has happened elsewhere. My town's only ever had one "gay bar" at any given time, and each of them in turn has started out decidedly 'gay,' essentially opened by gay guys for gay guys (and to a lesser extent, lesbians). Then guys start bringing their fag hags, then the fag hags start encouraging their straight girlfriends to come out, too, because it's "so much fun, and the music is better, and the dancing is better because there aren't guys groping at you constantly."
So the straight women show up and do their own thing for all of 5 mins or so, but then they realise that they kinda miss grinding with the guys so they start trying to grind with gay guys (many of whome-- for some reason that's inexplicable to me-- go along with it like they've suddenly gone softcore bi). Then straight guys (and often the most obnoxious ones, who can't pick up at the numerous straight bars because they're such pigs) hear that there are 'hot single girls with their guard down at the fag bar' and they start showing up.
Before you know it, the straight people outnumber the gay ones, none of the gay people know who they can flirt with anymore without getting some remark that has no place in the place, but the management-- eager for the money that all those straight people have, since there are so many more of them than there are of us-- soften the gay images, trade the huge pride flag for something a little more 'subtle' so as to be "more inclusive and welcoming to *everybody.*" More and more of the gay clientelle get turned off and start to stay home. Then the management's argument becomes "well the gay demographic was fickle and stopped coming and supporting the bar, so of course we toned down the whole 'gay thing.'" It's been the life cycle of every gay bar here, eventually they're just 'alternative,' then they're mainstream. Am I bitter? No doubt.
Does it warrant a ban on guy-on-girl stuff as part of the club's "style code," or some-such? Well I don't know that that would even be legal, but what I wish is that someone who really cared about creating an honest-to-goodness gay bar would open one and then make it SO proactively gay-- so utterly styled to a homo atmosphere-- that the straight people would feel as uncomfortable there as I felt the time my friends somehow talked me into going to the "Rockin' Rodeo" western-themed bar with the rhinestone saddle disco ball :-P And if the straight people complain, tell them there are straight bars they could go to if they don't like where they are. And if the gay people get fickle and revenue dips, try to ride it out for a bit. I'm just so turned off by the selling-out. Such is the pesky norm, though, when the management is more concerned with the business than with staying true to the idea.