The blue bird is going to die soon with Musk at the helm. He only seems to make decisions in the dumbest and most haphazard ways possible.
That's not to say that something else will kill it. It's more likely that for most folks, they'll just stop or shift to something different that's not like Twitter (e.g., Instagram).
Not because I love twitter but rather because of the following
1.Network effects are just that powerful.
2. This looks like a group chat killer rather than a Twitter killer.
So I think the blue bird will go on to live a rather long life.