Ah, but the Hyperloop will allow for small, individual cars of maybe 8 people (I'm guessing). This means that you get in the car based on destination and it uses switches so that there are no in-transit stops.
Following the kinks of a 100 kph expressway is likely not feasible.
Again, my understanding was that this was part of the original TDD (SF to LA) and they found that it was, indeed, feasible.