Yes, compared to what IRC was in the 90'ies - definitely. In the age of DLS the then common ping floods aren't as effective anymore ;-)
While I'm idling about there in several channels like #citadel, it has become quiet there, and non technical channels seem to die out.
I guess IRC has to less XML inside to be hip or commercialy supported nowadays.
we'll see how long irssi keeps working ;-)