This is down right scary, but it was bound to happen eventually. At least now it will light a fire underneath them to secure their communications. I doubt hijacking drone video feed would give them that much. It'd just give them a first hand glimpse of how effective they are. You can go onto time.com and see what the video feeds look like. They did an entire special on what the drones were and how they were piloted. One pilot can control a squadron of drones from the other side of the planet. Each one can cruise on surveillance mode looking for specific queues. If i had to guess drones are but the tip of the spear. It would not surprise me at all if the pentagon had far far worse hidden away.
Edit:
http://www.youtube.com/watch?v=mu1zwndOiXc