Masculinity keeps society held together as much as femininity does. If it were to be "eliminated", some women would necessarily have to take on masculine traits... if you wanted society to keep on having the character/luxuries it currently does.
Better get ready to work on oil rigs, power lines, salting roads, sewage disposal, quarrying, building skyscrapers, laying tarmac, defense etc. There's a lot out there that needs doing. Plenty out there I wouldn't wanna do, but you ladies would have to do it.