Hyperloop can leverage trillion in highly relevant fundamental R&D also. For example aircraft already operate at low enough external pressure to quickly kill the passengers ex: concord was under 1/20th ATM. Yet, loss of cabin pressure is a very rare situation. There is a lot of proven technology to maintain low vacuum cheaply, as a first step to achieving high vacuum. Massively improved battery technology enables reasonably high energy density's which are very much necessary. etc.
Now, sure there is a lot of new tech that would be needed. But, less than you might think.
But Hyperloop is unexplored territory. There isn't billions/trillions of fundamental R&D already done and given away for free by somebody else. I suspect that's going to have an impact.