To be fair, what i wasn't suggesting was the Story was over. No, even if they were to switch back. The story would just continue without the whole Body swap subplot. Just in the end, Saida is stuck as a volcano dragon while Brand is stuck as a Quetz. Neither of which are in a position to Actual pose a threat to a god. Hell i don't even think Sadia even knows how to breath fire at this point.
Also ps, Who even suggested that would end the story? Like brand suggested that they take the eyestone and Just run away and live together somewhere. As finding the stone was more or less a means to an end. Specially if you want Roko to ever be a living being again.