If you think ObamaCare is a disaster for those stuck enrolling in it - and it is - it has the potential to be a far bigger disaster for health insurers, who are getting stuck with a frightening mix of customers that skews far too old and far too sick. And since they can't turn anyone down, but they also can't force young healthy people to join the pool (and why would young healthy people want to?), the insurers are in serious jeopardy unless the federal government offers some sort of backstop.