I have UHC and they've been really good (max out of pocket like 2.5-3K for a year), but they've all been employer-sponsored plans, and they're definitely expensive.There is a demand within many insurance companies to pay out as little in insurance claims as possible and maximize profits. UHC is such a company and they provide a lot of junk dental and healthcare plans. I'm not surprised they bolted given that people who buy into the exchanges actually use their insurance.
I tend to think there's a pretty clear path to single payer here, and it's not something that hasn't crossed the minds of folks who wrote the bill as well as many journalists who continue to cover it. If you increase the Medicaid income requirement threshold and increase Medicaid reimbursement fees (which probably entails a tax increase) you can slowly work towards a Medicare For All type reality.
I'd suggest changing the name as well, to avoid the stigma of Medicaid. It worked for Stringer Bell.