Nah you're all wrong.
The only thing nostr will kill is IRC.
R.I.P. IRC
Hail nostr
Discussion
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)
I was just a kid when I first discovered the irc, but I remember all l33t h4hxx0rs at the time discussing client and server RFCs with the same fervor as today's generation and their NIPs.
Maybe you right, irc won't ever die, but I bet some irc:ers mightl enjoy nostr :-)
Yup matrix, r.i.p. i'm afraid it was overengineered from start, protocols not as newbie friendly as nostr.