Instead of having the elementals be a one time unlockable, can we have them permanently unlocked as a separate faction, but on par with the power of the dragons? Then have the evolved stages of the elementals be the one time unlocks that are extremely powerful?
Creating to separate factions for players to choose from would add more depth and diversity to the game, and would also create a stronger faction rivalry since you can run into them on the map more often, and fight each other etc. It would also help to foster another sub community of players that want to play the elementals over the dragons; which, given the current player count is an all around positive. Also having them be one time unlocks isn't so great when it comes to their launch day or overall, people will be excited and want to play them, but can't because they have to now unlock them first, which isn't suppose to be easy. That being said, it makes it difficult for the players who want to main them to enjoy the game since they are forced to constantly reunlock them.