If there was an M on the box, the same amount of kids will still be playing it that are playing games like Halo, CoD, BF, CS:GO, Medal of Honor, Rainbow Six, etc. The only thing that is pointless is pretending that the game will suddenly be fixed by putting that M there. Say only 10% of the Destiny community was kids, there's according to Bungie 30 million registered accounts. Say making it M reduced that by 10% again, that's still 2.7 million people that fall under the "17+" M rating playing it.