actually I can see the 250g limit being a positive thing.  It puts the impetus into drone makers to innovate and miniaturize, while delivering top notch performance.  Already we have a Canadian company whom have developed a 150g drone racer which is speedy and super capable - can even carry a gopro on it (Rotorx Atom).  I predict we will see gimballed camera drones under 250g producing video equivalent to a Phantom within a couple years.

And it is not the battery that is the hard part - it is the motors.  The battery is usually one of the softest parts on an electric model these days, though it is also the heaviest item.  A battery would go through a jet engine like a pigeon body would.  the motors might do real damage