>>1958732Lack of any eureka moments or development milestones that would drive further interest let alone solve very basic problems such as maintaining a vacuum over that long of distance. That's the first issue in a long list of very impractical design ideas around Hyperloop and it's predecessors. It's never been a viable concept. Even if we assume the basic problems have solutions the infrastructure and regulatory world presents infinitely more difficult challenges, such as safety in the event of earthquakes and natural disasters.
The California HSR which was the main target of Hyperloop/Musk is already one of the most troublesome and inefficient infrastructure projects of it's kind using technology that's been in commercial operation since the 1960s. SCMaglev is well developed and thus far is the clear demonstrated winner with regards to intercity transport solutions faster than regular HSR. When it's built out the Chuo Shinkansen on paper should make the trip between Tokyo and Osaka in 67min compared to the current Tokaido route's 2hr 30min via the fastest Nozomi service.
The next leap in overall transport technology will probably be supersonic aircraft that do not shatter windows along the flight path. Most people will be stuck flying subsonic, with supersonic planes all private or reserved for business and first class customers. If you give it a few decades we'll see musings about sub-orbital rockets for the super wealthy elites.