There are 3 realms as off making this suggestion.
Area 52 - free pick wow at its fullest permanent characters and the best realm
Al'ar - the seasonal realm with temporary characters that guves you some extra rewards I think Im not sure I never played it I dont like temporary characters
Mal'ganis - testing realm
Hopefully conquest of azeroth wont be a realm as well for the reasons i will state below.
With so many realms we split the playerbase instead of bringing them together. If we had just one realm, and when creating a character you are given a choice of making a testing character or a seasonal character we would have much faster queue times, starting zones full of life and much more chances for player interactions.
Now imagine CoA drops and it does have its own realm, free pick would be dead.
My apologies for my ignorance if it was stated somewhere that CoA will not have its own realm.
I am happy that you are voicing your concerns
We do indeed have a few realms, but those are for good reasons
First off, we have Al'ar, which is really great, not just for us, but for the player base in general
We get to test new concepts, throw up ways to play the game, which simply isn't viable in the long run, but really fun for a shorter period of time, and so on.
But not only that - it is also a superb way for new players to get into the game, learn about all of our features, and be on a level playing field with most others, as you don't have to do any catchup for a chance of being part of the end-game content.
Those two things combined have, over time shown us that our temporary realms, both League and Seasonal, create an influx of players.
As for CoA:
this is an entirely different way of playing the game, and caters to a somewhat different player base.
In our opinion, it wouldn't fit well in the existing way of playing Ascension, and as such, we chose to separate them. It also allows us to make changes to CoA that most definitely wouldn't be an improvement to the classless concept
I hope this clears up a bit - although you all should still feel free to discuss opinions, and thoughts on ways to do things different!