But communication and collaboration is just much harder work remote and you can't change my mind. I'm sure you can work hard to make it almost as good but it's never going to be better (IMHO).
I of course miss the meals and snacks.
Many people who work at these companies live in big cities where they don't have huge amounts of space and it's not conducive to being productivity, particularly if you live with other people, if you can't get some form of separation.
Those of you who are claiming this will be some form of revolution I think are naive. I've found that advocates of WFH are mostly motivated by that's what they want to do more than anything else. I mean that's fine but it often leads to thinly-veiled, self-serving, biased arguments and proclamations of the benefits to everyone.
If you need an office anyway you don't really save anything by WFH unless you oversubscribe your work areas (eg hot-desking) and that has its own problems.
All-remote might work best. I've seen this claimed but have no direct experience with it. I do know that mixed WFH and in the office is nearly always detrimental to the remote people and the team as a whole (IME).
I just don't think a company with 50,000+ employees can operate this way indefinitely.