well unfortunately need a proper source because I think you are way out, and also those that only pve will also distort figures. and now you say 4000, players in 3 servers thats 12000 people .
You know the saying about Statistics - lies, damned lies, and statistics.
But in answer to op its 3 days, bad week to merge them all, but I think things will settle down in a few weeks. Nobody likes change, but you adjust and get on with it or leave.
And there are usually 8 character on single realm for every russian players. My friend has 19 mains for pvp and he plays pvp 7/24.
Also if you put inactive accounts who dont play anymore , there are only 60.000 players on russian realms.
Because outland eu has 429.000 alliance players. Do you see outland alliance players everywhere? There are only 60.000 russian players as all russians say everywhere.
But as said we have had this for years, maybe with new blood things will change, sometimes people wont listen to vocal, sometimes they do.
Unfortunately if something works once they think it will work all the time.
You just dont have to take epic bgs as seriously as before, frustrating yes, but hopefully better things will come out of it, and new ways of doing things.