I keep seeing threads like this one.
Seriously, why don't you guys pack together and play the arcade since there always seem to be some of you who wants to do that instead of missions?
Little rant aside, removing the missions as a whole is a really bad idea, you don't remove content from a game which has so little of it, it'd be much better if there were some kind of limitations to all of them such as the one on daily missions.
http://i.imgflip.com/1bh6.jpg