Predictions for job(s) in the next expansion?

[SpeckledBurd]

However you want to justify hand-waving that there are already two pure dps jobs that wield 2-handed weapons is fine with me.

You're just being obtuse at this point. Samurai and Dragoon don't satisfy the desire for there to be a DPS job that uses a massive two-handed weapon as if they were Guts with the Dragonslayer just because they hold their weapon in two hands. They both have their own aesthetics and playstyles neither of which is "crush the opposition with a weapon as big as you are", no matter how big their weapon glams end up being on rare occasions. Dragoon's jumps and dragon lasers are not that. Samurai's fast, nimble attacks and iajutsu quickdraws are not that.