We have those clinics, they’re called community clinics and funded by a combination of local, state, and federal funding, plus charitable contributions. They’re the most cost effective way of providing primary care to the poor, and they get like no publicity.
Unfortunately, we also have a law, left over from the days when our cultural norm was that you only went to emergency rooms in an emergency, that requires an ER to treat anyone who shows up with anything without cost when they can’t pay for it. If that legislation doesn’t get narrowed down and liability limited so an ER can offer a 24 hour “drug store-type” low cost primary care office and refer those with the sniffles to it, health care costs are not going to be reduced.
As soon as there are people who opt for first-aid type health care combined with boosting their immune systems and a healthy lifestyle, the market will respond. I'd wager that after ten years or so of that option, people who choose it would be just as healthy as those who choose to be slaves to the health care -insurance - big gov "solutions".