I've not seen a private event Dreamlights Show Stop since TDL's 30th!
About Spooky Boo!, Maybe I'm too used used to how TDL does things, but I'm not liking that there are no dancers in Toontown/Tomorrowland on the way to the Plaza. This isn't a hub show, its the traditional Halloween parade.
These are not equal options, and they are not related decisions. OLC wants seasonal events year round, and they budgeted for Pixar Playtime to run for three years. There was never a question of if it would be back.
Celebrate! is going away because they want to do big nighttime castle shows again, which is a good thing! Celebrate is wonderful, and it could theoretically return in the future.