Although, as I said, Disney has made some changes where they could, to help with the crowding. Just recently there was a story about them removing benches from
Disneyland to improve crowd flow through the park, so sometimes the changes needed are relatively simple. The hard part is how to improve flow without negatively impacting the experience. For example, we've been in MK when the Main Street bypass was open (the street that runs behind the right side as you face the castle). We took that route but we've been on Main Street hundreds of times so didn't feel we were missing anything but the crowd. But do you want first timers being funneled onto that route and bypassing that first experience of walking down Main Street and getting their photos of the castle?
They've also expanded shops, like making The Emporium one giant store behind the left side facades, even eliminating one side street in the process. It's better for crowds, sort of, but it forever changed the Main Street experience.
Obviously, I don't have the solution. I just know it's an ever-growing problem and I fear that sometime soon, it's going to hit a breaking point.