Isn't it obvious? 

If every dollar in the top tax bracket is to be taxed at 53% people will evaluate whether its worth it to work "extra" or not. For many the balance will be shifted to favour non work activities. Sure they will make less overall but when you are only making 47 cents on the dollar you really think about whether "overtime" is worth it. For many it will not be. High taxation is a dis-incentive to work more. 

And given the class warfare and demonization of physicians who are already burnt out and working absurd hours due to the worst wait time amongst Commonwealth countries, don't expect physicians to continue doing  more. Quite the opposite. 

Sacrifice? Absolutely. To be a martyr? Absolutely not. See what happens to wait times.