Well, like Lok, i've seen the old mission system from back in... 2010? Was it? I don't but also i've seen many different items introduced into the ninjaworld. Not to mention i remember the introduction of the first ninja world and how it's grown to be what it is today. Like he said, all new items are put in place for members that sometimes have great hype but then suddenly die out due to lack of interest for one reason or another. I can understand his sceptisism. And i don't blame him.
But i am for the idea, don't get me wrong, i actually put in a mission system for members to gain permissions from me. I can provide some examples if you like. But i feel like if you want to do this you need support, either from one mod backing you such as Lili as the new NW mod if she wanted to, or some sensei. You realise it will be alot of work and there will be argueing, as, afterall, it is the NW. Think of all the down sides that come with this and if you are still sure on it, i could give you a hand when i have some free time