Adrian,
I'm not opposed to carts, simply disputing the notion that they are an essential for survival. Their raw financial benefit is clear but the broader issue of promoting those non essentials and who you attract with them is a more subtle issue. Those society days for the local pub or radio station show great returns on buggy hire, not to mention the revenue from them as a whole. They equally however have your core demographic looking elsewhere, leaving you in a race to the bottom.
Again, dispute it all you like but who is actually struggling and who isn't? Whilst I'm not suggesting there won't be any casualties from the top end, I don't see any abundance of first or second tier classic courses hitting the skids.
You seem to assume, and I'm sure you'll correct me if I'm wrong, that tomorrow's average player will demand magpie shiny, binary golf and convenience when they're 65, simply because that's what they want from their Playstation at the age of 20. Reality is that classic courses have retained the interest of multiple generations simply because there's far more to discover, hence the endless allure and applicable repeat visits. The hook is stronger because there's so much more to explore. The fact that a few of us here can articulate that while the average golfer can't is of no relevance.