The Gold Saucer is going to stay relevant (Yoshi-P has made this clear with wanting to add more TT cards, more mini-games and more 'big' games on a scale like Chocobo Racing and TT) who knows maybe down the line they add something you like to do. Or maybe as a way to please everyone they do set it up wherein the items are only available during a FATE at first, then once the FATE is gone they move it to the Gold Saucer as a way to still obtain it, if later on down the line you realize you want to have it.