Medicaid is good, but it has gaps - and with the growing wealth disparity, your middle class people without insurance will be the growing demographic, they're also the demographic most hit by property prices rising, the demographic hit by wealth inequality and the demographic hit by rising inflation if they've got mortgages, young families and/or tax increases to cover Medicare for the Boomer generation (who, by the nature of their moniker are quite numerous). This is a perfect storm.
We don't have a perfect programme, but we do have a program with five general principles. The NHS is free at the point of use, it must provide a comprehensive service, it's available to everyone regardless of their means to pay, based on clinical need and funded through general taxation. We're beginning to struggle as more and more services are added and more and more boomers require the service (especially in winter) but the general principles are effective - and most of us Brits wouldn't have it any other way.