You know there is zero chance of switching to all government insurance over the next twenty years.
First, it’s not politically possible.
And even if it somehow did get 60 senate votes, a House majority and a president to sign off on it, it would be phased in over many years.
You’re acting like someone could get elected and have it done in one term.
Private insurance as an option will never go away.
Notice there are private schools even though every American has access to free public high school.
Do you fear Medicare as an option to purchase or the expansion of it to people under 65?
Of course there would be complications.
Health insurance is a huge industry. Medical billing is tricky.
Thousands of jobs would be lost or transferred to a government agency.
The obvious step is to firm up the ACA and add a public option that individuals and then businesses could tap into. That pays for itself and expands options. If it works well, it will grow. If private insurers are preferred, they will hang around.