Darn right. That would be a perfect addition, and a good way to celebrate all the friendships made, and shiny objects collected, over the course of the game.
I just hope that future installments dial it back on the dumb "secret underground facility" cop-out whenever they want to add something new. How many labs, battle arenas and storage sites *can* you build underground anyway? And most of them with catastrophically weak roofs that break the moment a hero walks over them?
If it turns out Hojo has a secret underground chocobo laboratory hidden under the Chocobo Ranch, I might actually want to slap someone.