Health savings accounts are great if you're young and healthy, or middle to upper middle class, and are relatively useless if you have an actual emergency that costs a significant amount of money. Hello cancer and heart attacks. Hell, diabetes maintenance is hard enough as is. I had two ER visits for my daughter that have cost me about $3k out of pocket in my first year with an HSA (cost about $5k before insurance negotiating down the price).
Besides, it's not the $150 doctor checkup that's bankrupting people and exploding costs in the country. It's wildly expensive medical tech, prescription drugs, just generally out of control medical costs (high deductibles and expensive premiums), in network/out of network unknowables, and administrative bloat. More private insurance in the US won't help any of this.
There's literally no one who is getting rid of the VA healthcare. Ever. Not even Bernie. Same for preexisting conditions. Both political nonstarters.
And none of this touches the very serious ticking time bomb for families reaching their late 60s/70s--long term care costs, which will eliminate the wealth of all but the most wealthy/healthy/AND well prepared (But would be covered under M4A as written)