A bit more of a direct comparison would be IRC to, say, Matrix. Last year I see an article announcing Matrix user count and it was more than all the internet users combined in 1997. This is a near-nothing number in modern internet scale, not even 4% of Facebook userbase, but I’d say that Matrix is about as close as I can conceive of “IRC-like” mindset applied with more modern principles in play. Yes you have billions in more popular social networking and communication networks, but there remains many millions of people’s worth of “internet” that resembles the 90s in some structural ways, which is how many people we had on the internet total in the 90s.
One huge difference is of course that no longer does a wider populace see those folks as potential pathfinders for others to join, but their own little weird niche not playing the same way as everyone else, with no advantage that they can understand in play.
They say to hold their beer and watch this…