Imagine that men are already gone. Do you want to bring them back?
Violence is not a male thing. The reason it seems to you as if violence belongs to (and will vanish with) the male sex, is because men, due to the patriarchy, are in the social, political and economical position to find a greater outlet/expression for their violence than women. Seems more reasonable to put all that we have into getting rid of the patriarchy (every trace of it; including the passing off of a male family name), rather than taking up this extremely arrogant position that we somehow know enough (about anything) to reach an existential decision regarding one half of our species, or that we can imagine what the outcomes could possibly be.
Just out of curiosity, how do you imagine such an idea could be implemented world-wide, even if a significant number of people agreed to it?
You said that doing away with the patriarchy is challenging because violent men are in the way. Wouldn’t the same be true of the shutting down of radical ideas like this, just to an even higher degree?