The probability of WA voters repealing the unconstitutional income tax is maybe 0.2%. The probability that the WA Supreme Court repeals it is 0.
The only thing you can do is leave, and feel schadenfreude from afar when they inevitably lower the threshold.
“Washington state Made us a promise. Give us your career and your pension will be safe from taxes. This year Olympia broke that promise.”
Washington’s new income tax is a retirement tax and it’s coming for you.