I'm not sure exactly what we should do. We can't just refuse to treat the unvaccinated (I half suggested this before, which I regret), but we need to maintain our ability to care for other people. I didn't make a conscious decision that landed me in the hospital. My roommate didn't decide to let a spider bite his foot. The stage 4 cancer patient whose "elective" surgery was postponed didn't decide to get cancer. The heart patient who can't get an ICU bed didn't decide to have a heart attack.
I could imagine having regional FEMA/national guard run COVID hospitals. But where would the staff come from? There are a limited supply of trained medical staff.
I'm just not sure what we can do that's humane and fair to everyone besides just provide incentives to get vaccinated. We probably need WWII level propaganda to convince the unvaccinated.