"many many" lol no. It's actually only a tiny % of the actually population.
Also Blizzard "Half" PvE realms... are all low population except for Silvermoon EU (Alliance) and Draenor EU (Horde) which are the ONLY high population PvE realms.
Every high population realm aside from that is PvP. There is a reason why Blizzard have introduced Connected Realms, it's to keep them from shutting down entire clusters of PvE realms because they are simply dead.
Source:
https://realmpop.com/eu.html
So please... No-one half good at this game cares about precious PvE realms.