It will be interesting to see how this turns out.  I think WA State's income earners being about .5% means not many have to leave in order for the law to result in losses.

 What I am most surprised by is how many people think someone making 1 million and One dollars will pay 99k in taxes on 9.9 marginal tax rate.

That must be on principle, then, because it is not that difficult to create a zero income for tax purposes when you are rich.
But perhaps moving is cheaper than a good tax advisor.