for us anyway.
Now the Medicaid expansion is an issue, but the law was written where all states would have the expanded Medicaid for the poor. Then, the Supreme Court stepped in. That should be easier to figure out a way around, than scrapping the ACA and starting over with a single payer plan that is guaranteed to fail as long as 40+% of the populace is opposed to it (rightly or wrongly), and another good chunk of people -- who might be fine with a single payer system -- aren't going to believe it will be cheaper to them or better than what they have right now. It doesn't matter if single payer is better, too many people don't believe it is.
To me, a public option gets us there faster. Those that don't want to have their coverage changed can keep paying for it. Those that think a public option will be cheaper and better, can choose it. Overtime, if the public option is better, people will gravitate to it and what would essentially be single payer.
But, fighting for single payer will most likely end up with repeal of ACA and a crummy voucher system.