Unfortunately, healthcare is something like 17.8% of the economy. Health insurance is an extremely complex system that will not be easily wound down. Increased taxes are a certainty. Some people will have to accept reduced service if costs are to be managed.
People who pay for their own insurance are easy. Eliminate their premiums and raise their taxes by a lesser amount.
Those enrolled in an employer system would need to pay the extra taxes out of pocket. Can you mandate raises for those people to cover their taxes?
What about retirees with gold plated health insurance as part of their retirement package? Will taxpayers assume that burden?
And there are self insured companies and small businesses etc.
Single payer is probably the most logical long term solution but there needs to be a transition. The devil will be in the details. Warren needs to offer those details up for debate.