If you built HSR so it had R-rated amenities and the equivalent of ‘dinner theatre’ with multiple assassins, or ninjas, or some other form of politically-correct vicarious stimulation… maybe.
Problem is that at our transcontinental distances, even with maglev trains the ‘entertainment’ might start to flag, or even induce a kind of Stockholm syndrome. The amount of this actually generating chronic repeat riders for (even more very expensive) true HSR would seem to me to be limited.
Overmod’s ideas sounds like ‘Murder on the Orient Express’ + ‘Supertrain’ + ‘Blade Runner’.
This one’s an assassin fight movie starring Brad Pitt that just happens to take place on a train. The could have set it on a cruise ship or large jetliner and it would still be doing just as well.