I think it will be 10x worse than the 90's tech bubble. I was there, it was painful.
What precisely makes you think it will be 10x worse?
My bigger question would be how much housing prices and rent would go down. They tend not to go down as much due to subsidies and stickiness. Absurd housing costs are the key thing keeping me away from the bay area, but it is so bad I'd need a 50% drop to make it close to reasonable.
They won't go down while Chinese and Indians are moving in.
so what about the greedy white people that sell to newcomers at inflated prices in turn pricing out their "own"?
I wouldn't worry about it too much- this entire worldwide market is worth 1/200th of the US stock market
which is worth 1/200th of the valuation of SF unicorns..