I think most agree that "super" guilds are the quickest way to kill a server. I personally really like some of the ideas in this thread for new events, and I think new events is much needed.

How about a quick short term fix being some sort of cumulative reward based on guild level, and then a cap put on the number of cities (3?) that a guild can own. This would also add an element of leadership to a guild to decide what is most needed for its members.

I play in a server that has one clearly donminant player who has a deal with the next strongest guild (potentially actually the strongest) that they be gifted one level 1 city and one level 2 city, and there will never be an actual battle between the guilds. Instead they battle against anyone else who challenges them. This approach has already killed off the #4 guild, and is now killing off the #3 guild.

Not sure why players are so keen to actively turn this into a farming game, but its an approach that drives a lot of players away from this game.