The natural progression of that is a cyclical squeezing of the middle classes via revenue extraction and of the working poor by cutting services.
I used to advocate for doubling all tax brackets. A friend ran the numbers: the result is volatility. The middle class has stable earnings in a way the wealthy do not. That doesn’t mean we can’t tax them more. But there is a trade off.
It's not like the top echelons of earners have a bad year and GDP plummets or anything; I'm not sure what "volatility" means in this context as far as tax revenues but I can't imagine it results in huge variability or uncertainty.
Which, looping around, is precisely why the ultra-wealthy want to prevent anyone getting the idea of taxing the upper-middle class: that's what they mostly disguise themselves as for tax purposes.