It's happening with the other ones too. Seems like "What's On" is pretty much gone...
You can only have a "whats on" if there is something on, an defiant villains has never had anything on
I think it's just adapting to the way players seem to prefer to organize stuff - if someone wants to run a particular TF, or stage something like the Robot Rampage event, they just make a special thread about it, which attracts more attention becuase it actually gives you an idea of what it's about in the title.
@Golden Girl
City of Heroes comics and artwork
Also noticed that a certain hero server have several other stickies.
It's all so unfair, the little villain whined! 
Um, guess I should PM GR about this, but..
...noting seemed to happen with the "What's on" thread after all.
Must admit I'm at least rather happy the old, obsolete thread was removed and I guess the defiant event and defiantbadgers channels sort of fill the vacuum.
still... ...a bit sad!