Hard to see this passing for a lot of reasons. Universal health care as an idea is quite popular. Implementing it would be a nightmare because even if money is saved for the system as a whole where and to whom the money flows from and to becomes drastically different. Kaiser and Sutter are 2 of the biggest employers in the state. Both collapse without either high premiums (kaiser) or high private insurance payment (Sutter).
Many employers will be against it and the fact that they can no longer use insurance as a competetive advantage in employee recruitment/retention meaning the will *gasp* have to pay people more money to retain them. Many people with good insurance (e.g. the tech industry, unions) will balk at losing it. Add to that that passage would require supermajorities in both houses (which D's have, but can't afford defections), multiple propositions to pass, and federal medicare/medicaid waivers, possible authorized by congress) and it seems like a longshot.