Well, a side-point but maybe a very important application might be to figure out a way to pull energy out the vacuum. Not to distract too much, but do you think that is possible?
I know this gets into conspiracy-type stuff, but there are many that think Tesla figured out how to do this, but was shut down essentially since the financial interests were in the process of building out his first generation technology, the power grid, and they stood to lose a lot...as well as Standard Oil and it's offshoots.