supa, it's not like canon's ending the consumer-level 70-300's. I think the point is pretty clear -- if you think those are good enough for your uses, buy them. plenty of people have, and plenty of people will continue to do so. if somebody wants to shell out $1500 for a weathersealed, high IQ 70-300, then they have something to spend their dough on. everybody goes home happy. that's what you do in business, find a market, and then deliver a product that captures that market.
I think most people buying L glass are focusing on both image quality, and quality images. I find it hard to imagine anyone spending that much money on a hobby, and then not taking it seriously. I'll speak for myself as an L-glass owner, but I think the same goes for lots of others out there: sure, I don't think I create images that deserve to be called "great photography". but that doesn't mean I'm not trying. truly great photography doesn't come easy (and shouldn't come easy, otherwise, whats so great about it?). but it doesn't mean we can't all aspire to great photography.