It looks like the 5% wealth tax on billionaires on California is not going to pass. At least so far, that's how the votes are going.
However, my take on this is that wealth taxes are needed and will be popular, but perhaps can't be done state by state. The reason this vote failed is because the wealthy can escape it by moving jobs to other states. What we need is a national or even international level wealth tax agreed between the EU, US and others. There should be a provision in it that wealth taxes in the US are paid by people that own US companies and have held assets generated in the US or lived in the US for certain periods of time. Something that can't be avoided just by saying "Oh yeah, I live in Panama now".
I think people would vote for that.