Aside from the “master switch gene,” SRY, the Y chromosome (only found in men) contains very few other genes. And it’s the only chromosome not necessary for life. Right now, it’s in a state of degeneration, shriveling up for males. This degeneration has occurred because the Y chromosome is only ever present in one copy, passed from fathers to son, meaning there’s no chance to dodge genetic mutation. As for whether it will disappear, the scientific community is still divided, but either way males will not disappear. The SRY gene might just affix itself on a different chromosome.