What Roles would you like for Samurai and Red Mage?

[Intaki]

There's simply nothing else that isn't some obscure FF job that could be a tank after Samurai and so SE would be a bit foolish to waste such a choice on another DPS.

This is an argument you should have been making before they made DRK a tank. Now that there's already a two-handed sword user tank, I can pretty much guarantee that SAM will be a dps (if it ever gets made at all).

You're also neglecting the possibility that SE can simply create an entirely new class. They've already shown with Ravana that they're perfectly happy to not just take from the franchise mythos but to add to it as well.