Most societies that want to last will find something to do with them, and while the 20th century alone has had some serious population bottlenecks, I'm always just a little skeptical at the idea of 'we've always gotten rid of roughly 50% of men one way or another.'

The answer to this problem has always been give them a reason to participate in society. This will never get better unless we stop catering to feminists who are determined to coerce them into doing something that doesn't benefit them.