I still maintain for the 50th they should do a new parade that takes inspiration from both Spectromagic and MSEP and call it the ElectroMagical Parade. Since it would be for MK 50th each segment would be a tribute to the park.
The music would be directly influenced by the Original Spectro soundtrack. The opening unit would be based off Main Street USA the spectromen, now steampunk influenced, creating the electricity needed to "run" the parade. This plays into the turn of the century, discovery of electricity motif that main street has. From there the following units would all take inspiration from the other lands of the MK. You could have things like pirate ships and a jungle cruise boat for adventureland, Space ships and Monsters for Tomorrowland. Frontierland could feature the steam train and riverboat with references to the country bears and splash animals playing instruments throughout. The final unit would be based on fantasyland with the carrousel and castle. It would bring back the black and white to color effect.
I think it would be a great way to blend nostalgia and pay tribute to the park for its 50th.