IRC is such a dinosaur and yet the most solid, reliable and working IM platform since literally decades. I doubt it will ever die at this point. xD

Could be wrong though.

That said, I think Nostr could overrun Matrix. I am looking into building a PoC of a better chat client and simultaneously introducing new NIPs that I drafted to "fix" chatting on Nostr. It does work, but it is hella clunky. x)