Raising the tax rates to 45% would (optimistically) generate 250 billion in the first year, which is ~20% of just medicare and medicaid. Which is only to say, improving access to health care and making it sustainable in this country is a much more complicated problem.

EDIT: Links:

- http://www.nytimes.com/2015/10/17/business/putting-numbers-t...

- https://www.cbo.gov/sites/default/files/cbofiles/images/pubs...