Opening Medicare to all would spread the risk over the entire population, not just the seniors who on average cost more to treat, thereby strengthening the program into the future. Medicare is proven to administer its system much more economically than the private insurance companies and would get more of every premium dollar into actual health care. It's already up and running. And since Medicare contracts out its paperwork to the private insurance companies anyway, the administrative people would not lose their jobs (but the insurance companies would have no incentive to deny claims because it wouldn't be their money at stake). Sounds like a plan.