Hmm.. well, im new to these forums (hey there). also, i dont have evidence for this, but i once saw that there is a certain species of lizard that does not have males. The females can reproduce themselves, they have the ova, and they fertilize it themselves. (though they still make some mating ritual before reproducing, which indicates males existed.)
So the hypothesis is the following: many years ago, the Y chromosome was a lot bigger, and it has been observed that it is still getting smaller. What if this Y chromosome was to dissapear? maybe males in the future will be an extinct race, and females would be able to reproduce alone.
Sorry for my english, im not native speaker, greetings from Peru to all, these forums are great
