Will People still use the classes within the prime fights?

[Catapult]

Dont forget PLD can learn an aoe type of sentinel. I doubt that will be a bad thing, lol.

This.

A lot of THMs also forget that Sanguine Rite gives them damage reduction when used as a THM/Black Mage.
White Mage has access to Gladiator abilities and thus Sentinel.

If anyone ends up having an issue surviving Hellfire or Memento Moogle, my bets are on it being the Bard.