Well I think soon in every firework show we will see 50 of those flying around and disturbing the view...
Its like people that take Ipads to concerts - screw all the people behind me, at least I will have a great recording!
Unless there are literally 50+ of these, they'll most likely be completely invisible. If there are 50+ there's also a good chance of a couple collisions. Given how expensive the drone + camera + transmitter must be, I doubt this is a serious concern anytime soon though.
They will get less expensive quickly, and you underestimate how dumb someone can be with their toys.
In a couple years maybe.. even still they'll be invisible. Which isn't necessarily a good thing when they're falling on our heads. But at least they won't be blocking the fireworks.
Not sure about the view, but I don't want to be anywhere underneath if one is accidentally hit with a faulty projectile or collides with some other drone.