Yes, but we could see that batteries needed to get X better in order for us to achieve Y results in the future. But how much better do vacuum chamber technologies have to get before you can make the biggest one ever built, that also has a high-speed capsule traveling through it, that is also impervious to armor piercing bullets? Furthermore, imagine if every airplane had to fly the exactly same path, and if any failure on that path prevented (at the very least) all subsequent planes from traveling that path. And finally, how are security lines going to get shorter if the stakes will be at least as high as airplanes?