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Doesn't matter. IRC serves a niche that there's always a community for that no matter how small it'd become. I'd place a bet that it won't die as long as there's computer and internet. Long live IRC.

> seamless scrollback and push notifications

Both are doable with modern servers and clients thanks to v3 chathistory. Ergo (server) and Goguma (mobile client) in particular make this work very nicely.

There is also Zulip, that I think is opensource.

Can vouch for Zulip. Threaded messaging is the best.-

v3 has a lot of features folks don’t talk about. But XMPP MUCs are still kicking too.