Why is no one dueling anymore?

I have fond memories of spending my time back in TBC and WotLK in front of Orgrimmar dueling against people and it was one of the things I was looking forward to the most in Classic/TBCC.

But neither in Classic nor in TBCC do I see any people dueling in front of the capital cities. During Classic, I figured people were out in the world doing things so surely the dueling community would have a comeback with TBCC once more PvP players come back to the game as well. But there's nothing. I even checked other servers but it seems to be the same situation everywhere.

I can only think of lukewarm justifications like people preferring to do something on their second monitor while sitting in a BG queue nowadays. Are there any servers that have active duel communities? Why do you think this isn't a thing anymore?