As someone who flies first class there is no way I'm flying coach to save time. Flying business is about the lounges, the meals, the service, and the ability to stretch out your legs.
Its always a tradeoff of comfort vs speed.
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).
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.