Anima´s good because it makes traveling easy for every single class. I agree that it´s a little too convenient and if chocobos or airships are introduced, we´ll (or at least I´ll) only look into those options once we deplete our anima. But I´m sure they´ll find a way to make us use the other transportation methods. They can make it so that you can only use anima to get to gates from crystals and not to crystals from anywhere in the world. Or decrease it to a really low number, to be used only on extreme situations. I´m looking forward to more options.