I too would like to see dinosaur skeletons and discoverable items which we could find and include in museums. This would fit with the paleontology idea which was mentioned in recent pack surveys from last year and this year. I don't know that I would want dinosaurs roaming around all the various worlds or being like horses / farm animals / pets, but if confined to a single world, sure. A time travel element where you can go to where the dinosaurs are would be interesting. Or perhaps, if you collected all of the skeleton pieces, you could revive a dinosaur that way and then add it to your family (this would be a way to include as a pet, but would make the threshold quite significant and would prevent NPC families from adopting dozens of dinosaurs which then are walking down the street).