I feel that some reasons for people leaving this awesome site is related to the fact that all we do is train to fight orochimaru or some other character
I don't think that's a glaring reason as to why someone leaves here.
We've had village wars before; they were alright -- sand versus mist.
We have curse seals (and seven star tattoos) and random beasts in the forests that provide boons that an affect your game.
We have sections of the map (and in the forest) that are events that are high risk for high reward.
The character or NPC becoming Kami and running rampant for us to all stop him is more of an RP thing (which would then promote Role play, sure, but also hinder others who do not want to participate [because whatever happens then is now recognized by only some]).
We have secret areas of the map that are secret and require certain items to reach.
As far as the chuunin role, any ideas how to suggest how that would work?