Is there a market for luxury leisure air travel, as opposed to services aimed at the business segment?
As has been pointed out, to business passengers, frequency is everything; but for wealthy leisure passengers the "experience" is going to more important than frequency. Services like the Orient Express prosper, and there are luxury cruises available in the market - and I'm not thinking about the so-called "luxury" cruises where enormous ships resembling floating tower blocks carry 5000 "cattle".
Perhaps a 747 kitted out in the way that has been proposed may work operating round the world air cruises for people with money. It would have to by-pass the main passenger terminals, to maintain it's exclusivity - so operating instead from GA or similarly "exclusive" terminals.
Such an operation would certainly be niche, but might possibly work. I agree however with earlier posters, if they are seriously suggesting attracting business passengers then they are on to a big loser.