Single-payer healthcare will not drive down healthcare costs, no more than federally-backed student loans have made college more affordable.
The last time politicians tried to "fix" (or, if I'm feeling generous, "improve") healthcare in America, they took a blank piece of paper, had the healthcare industry lobbyists craft a solution that required every uninsured American to buy "affordable" healthcare coverage from a private insurer (the folks paying the lobbyists) using federal money, then passed the bill into law without understanding what it was ("we have to pass the bill to find out what's in it", and the bills sponsors got angry when reporters asked them what was in the bill, remember "what good is reading the bill if I don't have lawyers with me to explain it to me"?).
So excuse me, but I'm a little reluctant to look to these folks for a solution to our so-called healthcare crisis...