Most people who use social media disagree, and unfortunately for you, it's their opinions that matter most as to whether they use a given social media platform.
I don't really care to follow celebrities and athletes either, but I recognise at least that I am in a minority.
My view is if they did do that last thing, we'd be in exactly the same place as we were when we started - with "fediverse" as a tiny niche social network mainly populated by nerds, off to the side of all the others.
I think people have kind of failed to keep a sense of scale here - fedi has something like 2million active users, Facebook has a thousand times as many. We are quite literally a rounding error.