No they can't. It only applies to those first applying for coverage...and like if they're dying.
Those insured who become sick are not kick out into the HRP. That's how insurance works.
Do you want to be in the same car insurance risk pool as trucks, teenage boys and bad drivers?
I am in great shape, exercise regularly, and plan to live to be 100. All I want is an inexpensive catastrophic insurance plan to cover me in the event of a disaster, and for nothing else. That is not available to me now, but it was not available to me prior to the ACA, either. I have mild, asymptomatic, non-life shortening or threatening atrial fib. It is a condition millions of people have; some are worse but many are like mine. Yet, insurance companies do not make such distinctions. Anyone with atrial fib is considered to have a pre-existing condition and was forced into a high-risk pool prior to the ACA. The insurance offered was very expensive. I know this from experience. I chose to go without insurance because I couldn’t afford what was offered. No I do not defend the ACA. It is even more expensive. But I fear that we will go back to high risk pools, which do not work. Been there, done that.