I think the real issue that is being talked about in the article is that long term, large scale "moon-shot" type projects are extremely difficult to launch in the private market, but history has shown us that the government is actually much better at such long term "moon-shot" things.
Sure SpaceX is cool and makes rockets for far cheaper than the government ever did, but with out a few decades of NASA spending a ton of money trying to figure out how to get into space in the first place there would be no SpaceX.
So I think what really needs to be looked at for projects like the Hyperloop is Government / Private partnership. Maybe even let the government take a stake in the company and earn revenue in the future to offset / repay all the tax dollars invested. Because unlike private equity, cash-flow is actually quite important to the government and they they are well suited to help out in situations like this.