I don't know if that's realistic for most people. Sports is a good one and meeting people during intramural leagues is a good idea, but its not like these leagues conflict with work hours anyway. And its harder since working bleeds into after hours. So it's harder to step away at 5 to play a softball game when you're wfh, or at least I feel like it would be tougher since you're basically always on call.

Overall the people who do these extra-curricular activities will probably continue to do so, but other people may not be any more inclined.