There's certainly demand for low-cost ocean voyages as vacations, with over 300 cruise ships in service (and cruise lines generally quite profitable).

It's high-cost, non-vacation, long distance travel/transport where ocean liners were beaten in the 1960s by airliners (and airlines, in contrast, are generally not very profitable).

Still, that solitary transatlantic liner carries more people across the Atlantic in a typical week than Concorde did when it operated scheduled services on that route, and not because the other Concordes were busy elsewhere...

In any case, the lack of senior business executives choosing seven day trips in plush private cabins as their preferred mode of transatlantic crossing isn't much of an indication of whether people in that price bracket will tend to prefer pay more to spend four hours in discomfort rather than eight hours mostly asleep.