I've done paintball once, pretty fun. Airsoft, no.
But what I really wish they'd come out with is a gun that operates like a real one: using explosives to propel bullet and use recoil to reload for semi-autos and full autos.
Except that the bullet is something really weak like styrofoam or rubber, and the amount of explosive is really, really small compared to that of a real bullet, and the springs inside the guns are also weak to compensate for the lack of recoil power.
No funky CO2 or electric systems, just plain, tried-and-proven good ole gunpowder.
