Yes, another every server is full post. However I want to offer a unique take on why this might be.
What if Blizzard is reluctant to keep releasing more Classic servers not because they feel there will be a drop off (because let’s face it, even with a drop off this is definitely not enough servers), not because of technical difficulties, but instead to protect themselves and their jobs.
What I mean is Classic was presented to the public and their investors as a nice little side addition to the main game, not something which is supposed to overtake the main game, and for good reason.
If your old game starts doing better than your new game in the long term then people start to ask questions. “Why do people love this older version so much more?”
It then becomes apparent that colossal, monumental mistakes were made with the current game, and in many cases the playerbase was simply forcibly ignored (PvP vendors, Titanforging).
I realize I make this post at risk of sounding like Charlie talking about Pepe Silva but I’m being serious. A lot of the current heads of Blizzard have a massive vested interest in Classic not being successful in a way that is atypical of most heads of most companies releasing a major product.