It should be clear that the plan is not just your typical California "soak the rich" plan. It's to replace private health insurance with single-payer.
So there should be, in some way, offsetting savings in health care / insurance spending that balance to some degree the additional taxes.
It wouldn't surprise me if many employers, especially white-collar jobs, simply raise their employee wages in a one-time move in the amount of money that the employer currently spends on premiums insuring said employees.
That said, it would likely be still be a significant net negative for my family, as our income would mean that the additional taxes would likely exceed the savings by a significant margin. And then we'd be stuck with single-payer health care, which would likely be a downgrade, as right now we've got tremendous insurance benefits by being part of a large multinational tech company.
And let's be honest... If this DOES pass, it's just a matter of time before it spreads to your states... Even Florida.