Understand the reasoning. It was a much different time. Good ideas 50+ years ago are different than good ideas today.It seems that you may not realize the lagoon was built specifically to prevent having any such commercial area abutting MK. Walt hated the development that came after DL opened, hemming it in on all sides, and he wanted to prevent that happening at WDW. He actively planned that approach to MK over open water, and if there’s anything we can say with confidence “Walt would not like,” it would be commercial development over or in the lagoon, getting in the way of the view of the castle.
DtD and DCA in California were built on the original DL parking lot (which I remember from my visits in the early 1960s). I think DtD is kind of “if you can’t beat ‘em, join ‘em” reaction to that area of Anaheim.
I have to say, my memories of the Matterhorn Bobsleds from 1969 trip sure met reality when I rode it more recently. That was my favorite coaster for years because of the memories from a single ride back then. My body hurts just writing about riding it.