One of the longest and biggest asks has been a look at tribe limits.
That being said, not too long ago an idea was mentioned to me about making a win condition based on War Points that can only be earned by fighting enemy tribes. This I believe is a much more effective solution to both mass recruit tribes and merge to win tribes as it becomes the only way to win the world through war.
That being said, merge/recruit tactics merely finish that world with a whimper, rather than glory. The true killer of TW2 is the lack of customer service, or even an active and dedicated development team.