Without knowing exactly which realms would end up being in that pool, I’m not sure that I agree.
The goal, to my mind, should be 2,500-10,000 per server per faction. The goal is to hit the “town effect” as several original WoW designers called it: The notion that there are enough people that you can never know them all and they’ll congregate in relatively large groups around the town (or world), but not so many that you’ll never meet the same person twice.
Ideally it should be impossible to reach a situation where everyone knows you, but possible that almost everybody knows of you, giving you a reputation around the “town”.
The effects of this design clearly shines through in Classic, and it also did in many prior expansions.
So I’d rather aim for that. If a realm has less than 2500 on a faction, merge it. If it has more than 10,000 there’s a problem that will require “splitting” in order to fix the realm, which is virtually impossible to do short of just smothering the realm with queues.
Unfortunately Blizzard have allowed some servers to get very, very large at the cost of many, many other realms, because people want to naturally congregate in cities, just like in the real world.
But the player truly is his own worst enemy here because, by seeking the “big city”, he deprives himself precisely of the properties about WoW that makes it so social and makes the world so endearing and engaging.
It is up to Blizzard to stop him in his track, and they have proven themselves incapable of living up to that task, which is how we got into this mess.
However, we are where we are, so I approve of merging servers until they have above 2,500 people or even 5,000 or more. Frostmane+Aggra+GrimBatol is in that range for both factions, so it’s a good realm.
EXCEPT there’s an EN-PT realm in there. It’s ridiculous. I remember asking for server merges. It’s a good idea. Oh, had I only known…
There’s this notion that we’ll get merged further… I doubt it. And if we are it’s going to be because of the death of Frostmane such that another one is needed to fill the void.