no, there are plenty of unexplored possibilities to work from on titans, its just that
1) no one wants to come up with those ideas
2) most ideas people do come up with, get rejected because they are different
2) even if everyone likes the idea, no editor would put it in since they are lazy and no version has been released in months from anyone
3) ID is dying, no second wind is going to come unless someone seriously works hard to make a better ID and changes it
This is very true, i have seen many good suggestions since I've started posting. Life and death are very obvious themes, they fit in very well with island defense.
Another suggestion was made about the titan of the mist. I found this to be particularly interesting. It doesn't have all the bells and whistles people seem to be demanding these days, but then again, neither do any of the other titans currently in the game. It's a sound suggestion (not to mention fitting the island defense theme like a glove), but somehow, it got overlooked.