I think there's a lot of story potential with their journey to restore Princess Amore. They could have adventures similar to the original Dragon Ball series and Princess Tutu, with Sombra and Hope having to adjust to the modern world.



Hi-jinks ensue as they have to claim pieces the lost princess from various characters. Like the diamond dogs keeping a piece in their caves? Or another character is keeping her as a family heirloom? What if somepony used a piece to make an engagement ring or had sewn her onto a dress? And nopony believes the crazy ponies who claim that their new crystal is actually a piece of a long lost princess from a recently reappeared ancient empire.



And then there's what would would happen if they were to succeed in their journey. There's no guarantee that Amore is just going to be okay afterwards. What if Amore had been found in a situation similar to Lapis Lazuli from Steven Universe, aware but unable to ask for help for a thousand years? And even if ponies are notorious for being incredibly lenient towards their enemies, would she just forgive Sombra for what he had done to her? And what would her return mean for the Crystal Empire, with Cadence and Shining Armour currently ruling over it?