I agree with Baluski, just raise the requirements to create a clan, & if the leaders account are deleted, than bye-bye clan...
I think it would be awesome if a clan would be able to start a clan war, with the goal is to kill everyone in a clan starting from the lowest person to the leader/founder. At the time the founder is taken out, if there is no one in the clan at the required level, Jounin, ANBU, etc. the clan automatically is disbanded. This way it encourages players to keep on playing & making themselves stronger to defend against other clans & attack as well....
Of course there would have to be some type of time limit you have to take out a clan, you know for <AKA> maybe 2 weeks to a month, well to a real small clan, maybe a day....
hahaha sorry I went off topic but that is what happens when I get into think mode...