Single payer isn't going anywhere — in either direction. It's not going to pass anytime soon, obviously. But after today, it's also not going away anytime soon.
Sen. Bernie Sanders will introduce his "Medicare for All" legislation today and, in addition to Sanders, four more of Democrats' top 2020 prospects — Sens. Cory Booker, Kirsten Gillibrand, Kamala Harris and Elizabeth Warren — have already signed on as cosponsors.
The bottom line: Yes, this is a big deal. But if it's time to take single-payer seriously as a political concept, it's also time to start grappling with the policy.