The ACA established programs to make payments to insurance companies that got unusually expensive customers but the funding for those payments has been blocked.
http://www.modernhealthcare.com/article/20160517/NEWS/160519...
But what has happened is that all (or most) companies are losing money on the exchanges so there is no one to pay into the pool. Congressional Republicans have blocked funding the pool with government money because the pool wasn't supposed to cost money in the first place.
I'm skeptical of that the public option will work as well as its proponents say it will. We already have non-profit health insurance companies, and they haven't completely eaten everyone else's lunch. But it's worth a shot, as long as it really truly sticks to that mandate of not being government supported. The argument would need to be really convincing given how many of its backers think it ought to be government supported any way.
A proper public option receives no more government support than a private company does. If answering to political pressure instead of answering to a board of directors turns out to be an amazing thing for health care efficiency, single-payer could be on its way. I think that's dreaming by people who have never run anything in their life, but I also think that they should be free to try and fail, as long as it's a genuine same-as-a-private-company public option.
When you want something to happen politically, you need to work from a position of strength. If you have had a bunch of failures recently, people will not trust whatever new promises you are making. (And saying the failures were someone else's fault is the worst excuse of all. It's not like all those people you blame the problems on have died.)