Yoshida himself stated that he feels like SAM would be more fitting as a DPS (but that is neither confirmation of the job, nor a guarantee that it will be a DPS). Ninjas use daggers and short swords (cherry-picking, but most fantasy games do make the distinction between dagger/shortsword/longsword) so still technically not a sword wielding dps like we want, and Red Mage technically can be categorized as a caster still (making the melee and caster counts even).

On the subject of SAM as a dps, I do hope their weapons, in all forms, are a proper set (katana + wakizashi). Might be a stretch to ask for both usable (like stances), but would set it apart from the others. Either way, if SAM is made reality, I'm inclined to play it cause I just like Samurai