If anything, if the twitter trend follows, FAANG salaries will lose heat. For the majority of the employees, a good chunk of the paycheck goes to housing costs. Wider WFH adoption will ease the overly localized housing demand, even with several days of WFO, longer commutes will be much more tolerable and the housing spread will increase. That would mean acceptance of lower salaries and lowering of housing costs over time.
One competing factor; as the seniority increases, the say on WFH policies increases, also the possibility of housing ownership increases (whether as primary residence or also with rental properties). That creates a perverse incentive to not let people go away in aggregate. Not saying individual managers will think this way explicitly, but might have an indirect influence.
Edit:
- Previously I stated 22k as H1B + green card numbers. In reality 22k was H1B only and 6k was green card. Source: https://www.myvisajobs.com/Visa-Sponsor/Google/225093.htm