With ejabebr's latest release in april, XMPP Provides listing tens of them and snikket becoming a thing, i'd say no.
Yet every now and then someone on the fediverse comes and proclaims it's dead.
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XMPP to me always sounded like an audio format or an x64 instruction extension. If you don’t already know what it is, I think most people would just gloss over it as “some nerd shit”. Which may or may not be desirable, depending on your perspective.