Unfortunately I will not miss the barrens, yes the Barren was kind of a rite of passage for most horde characters because it was the first introduction as to how absurd the internet/wow population can get when gather en mass. I don't know if it is just my odd luck or not, but being on my last class grinding to 80 I noticed that the barrens have gotten emptier and emptier (more barren if you want to use a pun) from vanilla -> bc -> wrath. I mostly think this is due to the fact that Blood elves' second and third zone are much better in terms of questing and loot leaving a good chunk of the Barrens to go to the Ghostlands. That and the introduction of the "LFG" system means people can be sitting almost anywhere and just chain instances instead of having to sit in the barrens waiting for people to "/1 LFG WC" which may or maynot be a catalyst to start people chatting in the barrens.
That said the Barren's chat will just be another wow meme that has fall to the wayside as the game progressed, just as "more dots, Leeroy Jenkins, etc" are barely known by a good chunk of the WoW populace. Sure some people stumble upon them, but when is the last time you've actually heard those people refer to those in game? Heck I don't even hear "You are not prepared!" anymore and that wasn't that long ago.