In terms of The Good Dinosaur debate, Good Dinosaur was destined to be a flop. They changed directors mid-production. The date constantly got pushed back. They changed the entire voice cast mid-production. These are all mid-production problems that occurred. I can't quite put my finger on it, but I felt that from all of the marketing and presentation of the movie it just didn't grab the audiences attention. I don't think the specific release date has anything to do with the movie's lack of success. Usually, a Thanksgiving weekend release date is a solid release in comparison to most. Hunger Games has been dominating the Thanksgiving release date for the past few years, but The Walt Disney Company had some minor success with Frozen released on that weekend as of recent.
With that said, The Walt Disney Company has had a history of releasing movies in the early March slot with mixed expectations. Within the past few years these movies consisted of: Alice In Wonderland (2010), Mars Needs Moms (2011), John Carter (2012), Oz (2013), Muppets Most Wanted (2014), Cinderella (2015), Zootopia (2016), Beauty and the Beast (2017). Some of these movies were probably not expected have a strong box office presence like Mars Needs Moms and Muppets Most Wanted. I always felt this was an experimental release date with movies at their time taking a risk like Alice In Wonderland, John Carter, and Oz. Some of those movies succeeded and some failed. With the more recent March releases, Cinderella, Zootopia, and Beauty and the Beast, I feel like TWDC has increased their expectations with this release period. Granted this is a new release date for a Walt Disney Animation production, I like this move by Disney. I personally feel that it gives confidence in the movie. IMO, I feel like Zootopia will be at the level of Wreck It Ralph and Big Hero 6. Both of which, I feel need to have a little bit more of a park presence. Finally, you can meet Baymax again. I feel like he is going to be a character that kids of this generation will enjoy on an ongoing basis.
What I am trying to get to is that I do feel like Zootopia will grab some park attention with possible character meet and greets at Animal Kingdom, but nothing really more besides obvious merchandise. This is as opposed to The Good Dinosaur which will have little to no presence in the parks even in Dinoland at AK. My personal prediction is that Zootopia makes $185MM domestically with a $52MM domestic opening weekend. As usual, I hope I am wrong on my prediction and the movie makes more.
Again, all of this is just speculation and opinion and guessing based on patterns.