During the crash of 2008, he scooped up very many brilliant young minds from tech companies, google, NASA,etc, who lost their jobs. It was easy pickings, and perfect timing. This is his true genius, he is a brilliant strategist and business man. The way he plays the legacy auto industry is really fun to watch.
On the other hand, electric cars have been around since before ICE cars. Since 1832, ICE: 1860. So nothing new, just repackaged and made sexy.
His Boring tunnels, were once called subway tunnels, which can transport a lot of people at once, not just one car at a time. Our green solutions are the old ones, that we had in street cars over a hundred years ago, but vanished quickly because of the car and tire maker lobbies. The green solution was called public transit. I also remember the reusable rocket thing from back in the 70ties. So he knows how to take old ideas, repackage them, and resell them as something better. Yes, they do work well, hence the brilliant young minds he collected.
MAID is a brand new idea, not sure if he will ever get it. His cars and satellites are all centralized. MAID thinks forward, as Musk obviously lives in the past, where he gets all of his ideas. Now if one if those brilliant young minds happens to hear about MAID who knows?