First of all, if we can get it, you can bet the bad guys can also get it. How much firepower is enough? Somewhere in the commercial it mentioned one of these super weapons firing a quarter million rounds a minute? How do you haul-carry that much ammo to a fight?
I carried an M-60 machine gun in Vietnam. The weapon weighed about 23 lbs. It was worthless without ammo. The ammo usually was strung in 100 round linked belts that weighed 7 lbs per belt! So the weapon and one full belt would be about 30 lbs ( next time you're at the grocery store, pick up 6-5 lb bags of sugar or flour and that would give you an idea of the weapon and one belt of ammo) and in a fire fight you can go through a hundred round belt in nothing flat so you can see how much ammo was needed for such a weapon. Everyone had to help carry the extra belts of ammo.
I can't even begin to imagine something like this. I realize it's not made to be toted around but the hand gun is obviously meant to be carried and at the rate of fire they claim it does, you'd have to have 2-3 people carrying ammo for the guy with the hand gun.
I think that with everything and all the ways we have in the world to kill people the last thing we need is a super weapon that fires tens of thousands of rounds per minute or second. Hope and pray some nut doesn't get one and go down the street in some major city.
Personally I don't see the need for something like this. If we want to kill all the people they claim these weapons can, just drop a small nuke and be done with it.