Earlier quoted context omitted.
I'm amused that IRC is the only one of those you listed that is still alive and doing well.
It's alive, but I don't know about 'doing well'. It survives among some special interest communities, but the usage is tiny compared to any of the major platforms now. You won't find your uncle on it.
It doesn't start out that way. First you have a lot of people pushing their favourite barrows. Then they set up IRC gateways. Then they bleed users to IRC. I've been to a few conferences that keep actual statistics of messages published, and it's always the same.
But it's well hidden. No one gives up pushing their barrow, so if you just listen to the conference gossip you would never know it's happening.