If we ever got single payer in America, it would almost certainly be a half-assed version of Canada's system, which is pretty half-assed already.
Canada's health care system was barely ahead of the US before the ACA by WHO rankings. Give it a few more years for the Obamarage to fade and Republicans to move on from intentionally sabotaging it, and we'll pass Canada in the rankings and never look back. Who needs single payer when Obama has given us something better?
Single payer is going farther and giving more people coverage. Obamacare is the half assed law the dealt with some of the problem. Also no the Canadian system will be ahead for a while if the US doesn't do more to help people get coverage.