They already tried that one, it didn't even last a year, in fact it didn't even see one summer before it was replaced. Besides the Lion King finale It was actually my favorite version of Illuminations. It would be epic if they bought back this show and used the Reflections of Earth finale.I said this some time ago on another thread but thought it relevant to this discussion: Rivers of Light over at Animal Kingdom will be a good bellwether for a modern Disney nighttime show that (hopefully) doesn't feature characters or animated IP. If they can pull off a successful show over there, then I would feel a lot better about a replacement for RoE.
Any replacement show for Epcot that features existing Disney IP/characters is a non-starter. To lose RoE for a show that includes Frozen or Aladdin or any other animated nonsense would be a real punch to the gut.