The article you linked to makes a good point about why proposals like Musks' will be swallowed whole by media outlets and the public. For those who didn't read it, the problem is one of assumed competence; Musk was a successful entrepreneur with Paypal, spaceX and whatever he did before that, and is very successful at marketing Tesla as a another success story, and so we're kinda predisposed towards seeing this new idea in a positive light, especially since it hits all the snake oil marketing high points ("It's going to be faster, more comfortable, and cheaper than comparable HSR ventures!") by making superficially valid claims that need professional expertise in order to be evaluated.