Well, then we can dispose of it since it serves us no inherent value at the moment.
As long as those of a certain gender exhibit any degree of behavioral trends, and as long as we are able as a society to discern these trends, masculinity will always have a place in our language.
Well, we can get rid of gender roles then. They are of no service.
That doesn't necessarily mean that masculinity or femininity won't emerge as concepts. While we may not need to rely on gender roles as a means of conveying social responsibility and expectation anymore, but they didn't emerge in a vaccuum.