As a Few Random Ideas to throw out that I've been carrying for a while, My ideas for an overhaul of Spectro would include at least a few of the following.
1. CAN THE SPECTROMEN! I think they are enourmously creepy, and while they're better now, I feel the parade could better be started with some Disney Magic Right away, with The Seven Dwarfs replacing the trumpeters on the very first float, and then brinigng in the Disney Fairies for the following units. The Fairy Godmother taking the top position on the title float, with Tinkerbell, the Blue Fairy, and the rest of Tink's Friend taking the other Spectromen positions.
2. The Three Sleeping Beauty fairy floats tend to get very repetitive, put them all on one float, and include Aurora and Philip dancing together in the street.
3. The Wishing star has always been a big part of Disney, and with their most recent film "The Princess and the Frog" that goes one step further, one of the Fairy Floats would be changed into a float carrying Princess Tiana and Prince Naveen with Ray and his Firefly family, as well as the light of Evangeline lighting the way.
4. The Other fairy float would become a wonderland themed float, taking you into the Golden Afternoon theme, with the singing flowers providing the light here, with Alice, The Mad Hatter, Tweedle Dee, and Tweedle Dum riding along. Cards with Light up Hearts would flank the float as well.
5. Besides these new additions, the whole parade does indeed need general lighting updates (Going LED), Sound updates, including new score for the Wonderland, PATF, and other floats.
6. Much in the way that celebrate (v2) added tons of characters to the streets, that would be a goal in this version of Spectro as well, pulling characters like Louis and Dr. Facillier for PATF, the Finding Nemo Fish in the Little Mermaid Unit, and various unincluded Disney Friends around the finale.
Anyway, let me know what you think and maybe we can come up with some other ideas.