This is a way to kill someone at a distance, with no obvious trace leading to you, and using nothing but an off the shelf laptop or phone. It's significantly more dangerous than any of the other known methods of murder because of the reduced risk to the murderer.
My understanding is that pacemakers, insulin pumps, and such have only limited short-range wireless capability. It's not exactly a 3G connection with a public facing IP address.
As long as you still need proximity and individual targeting, I think it's not a paradigm shift in murder.
