Bernie supports a singly payer system resembling that of Canada's. Biden supports an extension of ACA(Obamacare) tp add a public option such that anybody can buy into currently existing US Medicare, but not guaranteeing uinversal coverage.
So, my proposal intermediate between theiir proposals undoes the two biggest political economic problems with each sides. Bernie's problem is that eliminating private insurance he alienates 2/3 US voters who like their employer-supplied insurance. Biden's problem is that he has not offered universal coverage, which every other high income nation has.
So, here is my proposal. Let there be "Medicare for All," but make it what most people think that means, not just what Biden proposes of letting people buy into Medicare, but simply making any uninsured person on Medicare as it is. It is not all that good, so most will buy supplemental private insurance like nearly all actually existing Medicare recipients. So we shall achiieve the universal coverage that all other high income nations have, But this will avoid the politically disastrous proposal of Bernie to simply end all private insurance.