Ten years ago people used to ask me as a futurist whether cars would fly. Today cars go just as slowly, 80- mph, as they did in 1913. But trains are going faster and faster all the time.
Will Hyperloop ever be built? It does not matter. What matters is that people are thinking about fast train service. It actually will not make much difference whether one travels at 200 mph or 800 mph. What will matter is that one can work on a train. Whether LA to SF takes 1 hour or 3 hours will matter some. But that's not the most important thing. The most important thing is one can work on a train.