[kingnothing]

If Congress could decide to agree on something, they announce taxes are being raised by X% to provide Medicare for all next year. Next year, employers stop providing healthcare via insurance companies and everyone signs up for medicare. Done.

[coredog64]

One of the huge fights about ACA from the left was so-called "Cadillac Plans": Unions negotiated excellent medical insurance coverage in lieu of wages for their members. If you suddenly axed employer-provided coverage, nearly every union in the US would want to renegotiate contracts to account for that.