Edit: Sorry, I responded to the wrong parent.

I don't believe Matrix is better positioned than XMPP to succeed. On a technical aspect, Matrix hasn't managed to stabilize its protocol, and they've been a decade into it. This has resulted in only a single organization being in charge of the protocol, the client and the server implementations. This isn't sound, this isn't sustainable. And now, unsurprisingly, this organization is in a financial crisis, has lost important customers, has no budget secured to maintain its staff in the next years, and recently underwent a major licensing change that we can only interpret as a shift towards an opencore model at the detriment of the regular user.