1. Businesses moving out of California, especially NorCal. Sergey Brin already said two years ago that he would not have started Google in NorCal today. He was right. There's a lot more interest in other locations, such as Austin.
2. Remote work, and fully remote virtual offices.
Personally I know a bunch of people who declined offers in the SFBay to avoid the pincer squeeze of impossible housing costs + highest tax rate in the nation. A friend of mine did the math and realized that downtown Manhattan (!) was more affordable for him than the Bay.
This stupid rule will not be the last straw. I do think it will deter companies from starting large complexes in MTV specifically, and SF if it passes this same rule.
It is however a sign of the arrogance and greed of municipalities, and their mistaken belief that they can just keep squeezing big tech indefinitely.