I just was thinking about how BB can put some life to game, I think after XXL content BB have to come with studying the leveling speed for low players, if you can provide faster leveling way for low level to get level up faster, they maybe will keep playing game instead of quick quit, I really see very low amount of new players stay in the game.
Also, for building leveling speed, I believe if you change the speed for them and make the time to finish the upgrade less by 50% for basic and intermediate building (just keep level 5/6 for 7 days), this should keep some players in the game to know more about the game before quit!
Only rethink about low levels players (lvl 40 and below, or lvl 35 and below) so they can do more adventures, explore more building in short time before they get boring and upset of the speed when they see people with level 70!, as well as they can come with good production in short time to keep them interested.
I'm not sure if this thread belongs to discussion or suggestion, move it please if this is the wrong place.