I'd say the people at risk are the poor people who can't afford insurance without the ACA.
That's what Medicaid is for. One of the major goals behind repealing the ACA is to make insurance cheaper by increasing market competition, so I don't see how poor people who don't qualify for Medicaid are going to be negatively affected.
Particularly those with pre-existing conditions. Who are primarily older people. Which means Florida and Middle America. Who were among Trumps largest voting base.
This is the biggest load of bull being pushed around by the Left, and it's nothing more than a scare tactic. Even under the AHCA that was supposedly designed to kill every old and poor person alive, only a tiny fraction of the population would fall under this category (lived in a waiver state, didn't maintain continuous coverage, didn't have medicaid, medicare, work insurance, etc.), and even then there were federally funded provisions and state high-risk pools to subsidize such costs.
With that in mind, the premise of feeling like you have the right to
willfully not pay for health insurance when you're healthy but nevertheless feel like an insurance company should be forced to accept you when something bad happens is ludicrous and non-existent in practically every other form of insurance. But since even those dastardly Republicans won't let such people die no matter what Elizabeth Warren says, some of those costs would be covered where they
should be covered - as welfare.