Well, probably more than 75% of the advances and achievements in philosophy, science, art, society, religion etc. in the story of mankind has been done by people with the Y chromosome... That future wouldn't be lesbians with superpowers. Would be the return to caverns in three generations. I remember a Dutch program of TV a few years ago. A group of men were left in a beach and a group of women in another. After a few days, men had built a hut, furniture, had food and fresh water... Women slept in the sand and ate the little amount of food that the producers gave to them, and spend most of the day talking in the beach and complaining about the discomfort. At the end, the producers of the program send a man of the other beach to teach the women how to do something productive....