"I'd prefer not to risk transitioning to a universal system that might provide worse care than what I've always had."
Your insurance is employer provided? You risk that every day then. Lots of people in the past few years have woken up to find out that their job - and with it their employer provided insurance - has gone bye-bye.
Yeah, we have COBRA to continue it at exorbitant rates for some period of time. But health care should not be tied to employment.
I'd be OK with a universal health care system where employers can offer better but everybody has a baseline health care where nobody - absolutely nobody - has to struggle to get basic healthcare. (And that includes dental and vision, which is absolutely boggling that we've decided "oh, those body parts are not included.")