Instead, they'll do like Basecamp and get people together a couple times a year.
If you hired people on the basis of being remote and they're all over the place, if at the end of 2021 you tell them they all have to relocate to San Francisco, expect to hear a whole lot of big "Nope"s.
It shouldn't be some switcharoo that the company pulls off anyway. Every company that I've talked in the past year has clarified whether they are remote indefinitely or remote only while the pandemic lasts.
If you hired people on the basis of being remote and they're all over the place, if at the end of 2021 you tell them they all have to relocate to San Francisco, expect to hear a whole lot of big "Nope"s.