Probably a bunch of factors... Tier 1 city RE prices have made live entertainment venues harder to run profitably. GenZ studies have found a lower participation in "risky behavior" which late night clubbing may or not be considered. Mobile internet & smartphones seem to be killing all forms of live in person interaction. And finally electronic music of various forms used to be a niche, and now it's mainstream. In the…
I guarantee that only about one in five male clubbers were truly "only there for the music". Maybe fewer than that.
Women went along with it because, well, what was the alternative, and the contemporary culture encouraged it.
Online dating has its problems, certainly, but the risks people took in the 70s, 80s, 90s were kind of insane by today's standards. And also the amount of unwanted attention women had to put up with. Sure, some of the attention was wanted, but surely not most of it.