This (as a way to cut the cord) ranks right up there with perpetual energy devices.
There are finite limitations on transmission wirelessly, and in will not in any foreseeable future be beamed from towers to your device, or from your house to your car even.
Wireless energy transfer - Wikipedia, the free encyclopedia
Also if you look at the history of wireless power, you see people getting cm's for high power device and feet for lower power devices.
Long story short, don't become an investor if the opportunity presents itself.