Would this even be a true MMO with one huge world, or would it be something like a lobby system tying to small or medium maps, like APB and some other "MMO-esque, but not full MMO, so we won't charge a monthly fee" games? See also the discussion from the 9/21/2010 Bombcast starting at 49 minutes, which was spawned from the shutdown of APB, and led to a discussion of "shooter MMO's."

Personally, I avoid MMOs because of the recurring fees, the mandatory time investment of over 10 hours of gameplay per week, and the high failure rate of many of these. Look at what happened to the average APB player: out at least $60, after only three months.