Considering the fediverse microblogging scene includes Threads, which claims to have hundreds of millions of active users, I’d say its death is greatly exaggerated.
Yes, I know a lot of Mastodon servers refuse to federate with Threads, and yes I know their active user figures are likely very different from what they claim. But at the end of the day, it’s an ActivityPub microblogging platform with a considerable userbase and a very rich corporate backer.
In this day and age, if it’s actually important they’ll probably immediately send you a text message/WhatsApp/etc. anyway.