But as Nan points out, we aren't supposed to Watch more than 5,000 profiles, and since we have about 15 million, and counting, we'd need 3,000+ active users Watching the full 5,000 each, with no overlaps.
In reality, we already have millions of profiles which are only Watched by an Inactive user, who might be dead for all we know. This is the system we live with daily, and nobody wants to change it.