Earlier quoted context omitted.
The key is to be terrible and simple from the beginning. IRC works just as poorly today as 30 years ago.
Which is why its usage has declined ever more and more thanks to Discord, which is a pain in itself. Freenode's collapse in particular pushed a lot of people to just say "fuck it" to IRC in general.
Given similar people, similar collapses can happen to Discord or any other communication medium of your choice.