I love thinking about the attractions that "never were".
Speaking of the "Tragic Kingdom"...
I was watching Martin's New Fantasyland Tribute video the other day. There was a villains ride planned for New Fantasyland that started as a version of "it's a small world..." then Maleficent showed up, wrecked the track, and sent you to the underworld. The ride vehicle started as a boat, but then would connect to an above the head track, so it was a hybrid ride.
It sounded really interesting, and under different management who knows...
Who was the last executive that really cared about the guest experience, and had the Walt-esque mindset of always going bigger and better?