Elon Musk is an enviable entrepreneur. He resides in the rarified air of a credible tech celebrity and can command the rapt attention of the tech media with little more than a 57 page term paper for something that he, in his next breath, declares he won’t build.
Never mind the construction costs, rights-of-way, economic model, reliability. On the other hand there is no new science here either, he is proposing pneumatic pressure instead of vacuum pressure and that is a well understood force.
We need more people like Musk, who has built three companies in completely separate markets and in each case are capital intensive, highly regulated, and dominated by bureaucratic morass. If anyone could build high speed transportation that wouldn’t suck in California (e.g. high speed rail) I would put my money on Musk. too bad he won’t actually do it.