Fantasmic will always hold a special place for my family. It was our arrival day, and the first night time show that we saw on our very first visit in 2010. Our girls were 8 and 6 at the time, and our son was 3. Fantasmic was the first glimpse that we had of how special WDW was. The moat on fire, the steamboat with all the characters... it was magical. So even if it doesn't change, it will always hold a special place for us.
However, I would like to see a new rendition. We love it, and the location and theater are awesome. Spice it up, properly, like they did for Wishes at MK. We LOVE Wishes but can't wait to see HEA sometime (hopefully) soon.
Dan