Pretty good thread on why XMPP failed but SMTP didn't:

https://news.ycombinator.com/item?id=31519122

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XMPP failed? It's still used.

Sure, and it's actually surprisingly common (I didn't realize jitsi ran on xmpp). Which is encouraging

my exempeepee is goatmeal@apathy.tv

I'm lonely :)

I used to use Trillian. I had a lot of accounts on it: AIM, ICQ, MSN, Yahoo, etc. Those times were better. I don't know why it went away.

I tried to use it recently and found the popular software far too complex, both the server and client, and also far too limited. Not a good combination.

Xmpp definitely still used