There is a great deal of research (eg., see Enrico Moretti and Ed Glaeser) that documents that you’re statement isn’t accurate. There are very strong network effects of educated cities, and unless you believe all future post-COVID network will be over Zoom or Slack (which feels rather dystopian), then post-COVID cities will do just fine.
In fact, you could argue that what will suffer is living close to suburban office nodes in order to save commute times. Even more young people may choose to live in cities if they can avoid the schlep out to their suburban office (think Google bused from SF to Mountain View, but where you only need to take them for big meetings in the office rather than every day).