[Crono]

I don't really miss the quests, I miss the playercount.

People don't want to stay on Classic. When they log on they're in some tutorial, isolated from the rest of the server. No one wants this, and because of the already low playercount they feel there's no incentive to keep doing the tutorial.

Even those who complete it will simply quit because of the hit detection and go back to their respective servers (most likely UN).