Hyperloop is a low-latency low-capacity transport method.
It's not much better at latency/cost than a VacTrain or a regular MagLev, but basically has less than 10% of the capacity.
Basically, the Hyperloop will be a transport method used by a bunch of rich people, not by the ten thousands or hundredthousands of people who'd use a HSR or MagLev on the same route.