in the future people won't be categorized by their genders. i kind of find it offensive we have to tick boxes that say we are girl or boy. what difference does it make? we are individuals and should not be shoved into boxes. they interfere with our growth. they mold us into boringness.
They will as long as they use their genetalia to reproduce lol. Sperm comes from the male, eggs from the female. Humans are animals, there are female and male counterparts for every other animal as well. Societal conditioning has presented us with ways to culturally be a woman or man in whatever society we are living in. There is a way to dress, act, talk, etc. That is what puts people into boxes. What you have as genitals defines your sex and gender, that much is science.