Based on primary returns, the electorate is still selfish and not willing to support a candidate who supports Medicare For All. The situation must deteriorate much further before the path to universal healthcare becomes unavoidable.
Based on exit polls, it’s clear the 65+ cohort is who is holding this up (although the 30-44 age cohort is culpable to a lesser extent, at least in the Dem primary).
Disclaimer: I received a few more years with my Mom than I otherwise would have because of the ACA. Universal healthcare is my hill to die on, most especially for my kids.