I mean, given that insurers can no longer dismiss patients with cancer or set lifetime caps, what other improvements would you make to guarantee coverage?
How about not jacking up their premiums, co pays and deductibles and taking away their subsidies without notice mid treatment.
Premiums, co-pays, deductibles, and subsidies are determined annually (registration in November/December for policies that begin on January 1 - something that those getting a free ride from their parents or their employers wouldn't necessarily know), and subsidies are based on income. Those registering for the new year and finding their policies untenable were free to find another insurer (since insurers can no longer deny coverage for preexisting conditions).
If I had cancer, you can bet I'd be monitoring changes from one insurer to another all the damn time.