They tried to try it, but there were too many hurdles so they abandoned it. California could be the same, but there are benefits it has the Vermont didn't, as well as a significantly larger number of people to negotiate on behalf of.
>As with any attempt to dismantle one American health-care system and replace it with another, Green Mountain Care was always going to be a long game. For starters, it would not be until 2017 that any state could get federal permission to change the way it used insurance subsidies created under the ACA.
https://www.washingtonpost.com/national/health-science/why-v...