Couldn't be because of certain factors such as live having much more space for people to be spread out in? I can't even remember the last time I was in the capital cities like Org. I am barely in Oribos for that matter. People love to congregate in city hubs in classic and soon to be TBC because it has the auction houses and spots where people meet to form groups. That doesn't mean live does not have tons of people playing it, you can do /who on various zones to get an idea.
Your anecdotal evidence is just that, anecdotal. Just because YOU see a lot of players in X server does not mean classic is more populated, or healthy or any of those things. The fact is you don't KNOW how well it is doing.
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You know what the vocal majority is? A minority of the playerbase. Most of the players that play this game don't post on forums, don't comment, don't voice opinions. They play the game and then either keep playing it over time or go and do something else and you'll never heard a peep out of them. Forums like this and reddit and other places are where a MINORITY of the playerbase goes to bitch, or gush about the game. That's it.
I don't give a flying fuck what the 'vocal majority' wants. If Blizz does X and Y and I don't like X and Y what do I do? I'd go do something else. I'd not make a thread saying "Blizz is out of touch because they did X thing in this patch or expansion, so I'm out of here!" I'd just stop playing.
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You're right the majority does matter, that is the silent majority of the players. The ones that do lfr, use the group finder, play alts, do transmog runs, hardcore raid, don't raid at all and so on. You don't know better than Blizz and to suggest you do is laughable. You don't have the data Blizz has at their fingertips, I don't either. But what I DO know is this game is over fifteen years old and keeps bringing in money. The game is still popular, still being played and that is amazing to me. I'm not saying Blizz is incapable of doing no wrong because we both know that isn't the case. But I'm not naïve enough to think I have all the answers either.