I disagree, but I would, wouldn't I? I hate the 30-second attention span world we live in now. If we reach a puzzle we can't get past, we bin it and go and play something else? I'm not for one second going to argue with that, because it's very true and very sad. It probably *is* the reason that adventure games don't sell too. But damn, do we really have to accomodate these children of the MTV generation who can't spend a few moments puzzling?
It's not so much that, more that people expect more from their games these days. Why are they stuck like that? People expect interaction and a richer environment, they expect non-linearity and a more open approach to puzzles. They want to be able to use their own ingenuity to solve a puzzle, not the ideas of someone else.