Opting out directly translates to not graduating. In our world, kids who don't graduate have a limited future ahead of them. Until post-secondary institutions start accepting students based on other forms of merit/employers disregarding formative education as a requirement nothing will change.

Homeschooling isn't an answer for most families either before anyone brings that up. I've got several friends who were homeschooled by uneducated parents and failed at life (one in prison, two whores, only one made it = that's one out of four).