The air is a poor wire. Lots of electricity will be lost just getting it to the machines, so for high energy applications, especially over longer distances, trying to use this technology would waste huge amounts of power. Not economically viable until electricy costs almost nothing.
I don’t disagree that it has many applications, but probably more low power things for a while.
Battery/energy storage technology on the other hand has a lot of potential, and is entering it’s golden age of research. The advances we have already made will look like nothing compared to the advances in batteries we will have in the next 20 years. Why beam power from the ground to a plane in the air when it could have all it needs onboard, and can charge in minutes once landed?