I see why you would conclude that "it's pretty obvious why a good portion of men are now left without anything useful to contribute." It sure looks that way based on the sheer volume of male resentment online. Try commenting on any forum with a female persona and you will be ready to call for mass internment of trolls.

But, the thing is, men are on not just equal footing, but a very advantageous footing especially where men dominate investment decisions. There is no excuse for men not to step up to the challenge of being equals when others carry a heavy disadvantage, still.