Of course they don't. People predict the end of social media sites all the time and nothing ever happens. Anyone on reddit around the Ellen Pao saga will remember the whole site was predicted to die and be replaced with Voat shortly. You'd go on reddit and the whole of /r/all and most sub front pages was just posts about how reddit was dead. Nothing happened. Then there was the youtube Google+ comments and redesign drama. Nothing happened.
Things are even less dramatic on Twitter, you can go on the app now and it looks pretty much exactly like it did last year.
Things are even less dramatic on Twitter, you can go on the app now and it looks pretty much exactly like it did last year.