If this passes, I think the state will see an exodus beyond its current level. My wife is a respiratory therapist (about as solidly of a middle-class job there is), and single filers with her job would see themselves fall into the 11.55% tax bracket, only about half a percent shy of California's current top tax rate. Talk about destroying your state by causing your entire tax base to leave. Under this plan the highest tax bracket would jump to 18.5%.
But to add to it, the gross receipts and payroll taxes on businesses is probably even more of a state destroyer than the personal income hikes.
Thankfully I will be hitting ATP mins this year and we can get the **** out of this decaying hell hole.