but it doesn't mean there are *more* assholes on IRC per capita.
Nope, I think that's becoming the standard for the world as a whole, with a few exceptions.
Anyhow, I haven't used IRC since the beginning, but I have used it for a decade. The population numbers vary, but anything I could find or do 10 years ago, I can find or do today. It's just as useful for those who want/need that use as it was then.
I don't really think it needs to change. I don't mind improvements being added, but it doesn't need to become another IM.