The US already has established air travel. And mass transit via trains is not a technological problem, it is a political and a marketing problem. Hyperloop has the potential to solve the political and marketing problems.
Hyperloop struggles mightily with the "mass" part of "mass transit." Its theoretical capacity is easily ⅒th of an equivalent rail line, and even then you're making some heroic assumptions about how frequently the "pods" can be safely dispatched.
Hyperloop itself creates the political and marketing problem. Is a fantasy created by the billionaire owner of a car company that is a distraction from the actual totally viable solution of contemporary high speed rail.
Hyperloop may solve political and marketing problems, but doesn’t solve the “cheap, safe, and fast transport problem” in any ways. That’s a completely impractical concept.