Users would need an order of magnitude superior
alternative, and most critically, users would
need to move en mass.
Yeah. Network effect. Arguably nothing on Earth has ever had such a powerful network effect as Facebook.I dislike FB for all of the usual reasons, plus a few of my own.
But I still have an FB account. I don't check it very often, and I've got notifications turned off. But ditching my FB account entirely means I'd lose access to dozens of people I wouldn't have a great way of contacting otherwise.
History tells us that something eventually will replace it. But, it's hard to imagine.