On some realms the situation now is that a one monolithic kingdom has rise, with everyone just waiting for the server merge (that's possibly is months away for some of the newer of older realms...).
But there are some player who got stuck behind in other kingdom with no cities and almost no way to power up.
Please consider ways to re-balance this unique situation.
Maybe allow players in kingdoms that has no cities at all to attack and plunder other cities even from the capital? (the attackers can still revenge as today)
Or maybe proceed in the void even to the next stages?
If conquering the entire map doesn't mean the game is over and closing the realm, in my opinion it need to be given some more meaning in keeping playing there.