Excellent stuff! Thanks for sharing... I also believe that classical music is for everyone, mostly just because I've come to enjoy it so much that I figure anyone can. I'm coming to think this way about all art. After seeing a documentary explaining the meanings behind different kinds of art, I enjoy it so much more and realize that only the day before I never had any idea of such beauty.
I've also been reading an old book (The Music Life by Thomas Tapper), where one of his ideas is that people of different abilities/inclinations serve different purposes in the world of art. Some can serve well by being a sort of bridge between the layman and the art world - like Zander here. Others have different specialties, like the professional pianist who could play better than Zander, but couldn't give such a seminar because that's not what they're about.
So I suppose there's a certain elitism, in that some musicians are directing their efforts to a more classical-familiar audience than others, but I agree wholeheartedly that any sort of condescention does no good at all. We may know more about music than our neighbours, but there are many things that we're ignorant of and I also appreciate when the mechanic doesn't treat me badly because I know so little about cars.