This idea has no prospect of success. Until 2020, Elon Musk wants to build its network of high-speed satellite Internet that will be available anywhere in the world. Internet will be free but it will need to purchase the device at a price of 100 to 300 dollars. I think this is a more promising project. Some satellites are already in orbit.
Well let's see how that goes but so far he has shown very little interest in Bitcoin so I very much doubt that his device will be a Lightning Node as I described.
Also bear in mind that his Tesla company doesn't even make a profit and now there are many competitors (so you might find Elon is actually not able to do much at all by 2020 as he might be broke).