We have that happening everyday in transformers. And even though there are no solid proofs that the magnetic fields of transmission lines cause cancer, how will the effect be with the magnetic field between two points??
Tesla had this idea but he could never really make it work. On a small scale it works (radio broad casts) but you run into problems when you ramp up the power. To start with I don't believe you won't be doing this at 50-60hz. I also wonder how you keep from collecting energy where you don't want it.
Lots of people are convinced that cell phones and powerlines cause cancer or other problems. Can you imagine the uproar if we started delivering actual useful amounts of raw power via electromagnetic radiation, where negative bioeffects might be a real possibility?
It's too lossy to be more than a niche. It would be nice to be able to transfer small amounts of power wirelessly- like to power clocks without a cord or to charge cell phones while still in your pocket, etc. But because everything remotely conductive will have current induced upon it, the losses are enormous.
Not to mention the transmitters are giant inductors that must be MUCH larger than the loads they serve (inverse square law), and will end up creating terrible power factor problems if widely fielded.