I confess I hadn’t paid enough attention to catch the difference.

Public option = choice of government provided healthcare or private insurance

Medicare for All = no choice but government provided healthcare

I suppose the MFA strategy is that for it to work there needs to be the entire population paying into it. I expect that given enough time the public option would easily become preferred by enough to be viable.

The bugaboo would be in the transition.
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“You never change things by fighting the existing reality.
To change something, build a new model that makes the old model obsolete.”
– R. Buckminster Fuller