I will not do business in California or NY due to excessive costs. Many others are either already moved out or are scaling back in high tax areas; Florida, Puerto Rico and Texas seem to be the top tax-friendly destinations currently.
There is still plenty of activity in CA & NY on a sheer volume basis but the barriers are high, the types of businesses are shifting[1] in a detrimental manner and the overall trend is declining.
Don't get stuck in a purely domestic perspective. Absentee ownership is rising in many major cities due to international capital seeking safe havens for preservation of wealth - empty dwellings purchased at high rates results in elevated prices for working individuals, ensnaring them in a life-long debt cycle. If CA & NY continue resorting to taxation as the primary method for increasing revenue, they will end up like Detroit.
Rome's final collapse occurred over the span of approximately a decade and offers a glimpse at what is likely to occur: taxes became oppressive and property owners simply walked away because it no longer made financial sense - the benefits are outweighed by the costs.
How much more revenue loss can be endured by property owners in NYC before capitulation? They can hold out for a while and everything will appear to be doing alright, then the stampede begins and collapse takes place so fast you'll wonder what happened.
[1] https://www.citylab.com/life/2018/10/how-manhattan-became-ri...