*prepares for the tomatoes*
I think the Wish float is one of the most successful units. It provides a unique IP that isn't celebrated anywhere else, and the smaller scale provides contrast to allow the larger floats to have more wow. It's good to have levels to parades like this for story telling, and pacing. I think it's a beautiful vignette and one of the only floats that isn't blue. That moment of the film was easily the highlight, and on par with Disney's bests. A few more smaller scale floats like the Wish one would really change the perception of the parade for the better. My top choice for an IP that would be perfect for a smaller unit would be Hercules.
It's the classic Hollywood Studios issue: too many e tickets, not enough b's and c's.