I don't think Uni can pull that off unless the final product is great though. They need something that generates buzz. People need to leave telling their friends and family "Oh my gosh you HAVE to stay for the nighttime show." If it's not Disney quality, they're going to leave saying, "It's okay, but Illuminations/Fantasmic/etc is way better. You don't have to stay."
Which one? The Christmas one is really, really good. The other one is really, really not.
But even then, those aren't nighttime spectaculars. They're like the appetizers Disney plays before their nighttime shows.