Lets make some numbers...
20 instances = 480 vs 480 = 960 total players...lets supose a 1200 population at peak hours => its a 80% of playerbase, and sure could be higher if everyone queued got a pop...looks like mostly ppl are queueing for city, if we had a higher playerbase we can reach 30-40 instances like before. But still mostly of players (>80% + no-pop) are enjoying ENDGAME content...so we need more xrealm to overpopulated faction to reach the endgame (desired for more than 80% of playerbase) faster.
I could enjoy population balance if it didnt hurt progression, but the game that we have right now it is what it is....so stop trying to be a "xrealm hero" going to underdog, you are really hurting the game...a lot of ppl left the game because "city never happens on primetime" and xrealming to underdog only help to keep this happening.