You're too honest for your own good, Allen
There is a sense in which Coltrane DID scare off the audiences and ruin the business (though whether that would have happened anyway is a question I can't guess at). I recently read Val WIlmer's 'As serious as your life' and was really pissed off at the whingeing from lots of the people she wrote about to the effect that the animosity towards them was because they were black - but the same people were proudly aware that their music was NOT the sort that one would enjoy going out of an evening and enjoying a convivial time boozing with one's mates, thus maintaining the profit levels of the venues. (The only people who didn't complain were the members of the Arkestra, possibly because Sun Ra created his own venues.)
In each generation, there are really only a handful of people, and Coltrane was one of them, (also Rahsaan, Mingus, Cecil Taylor) whose music captures the audience willy-nilly. The others, good as they often are, great even, the audience has to meet a lot more than halfway.
MG