After having an afternoon to stew on it all, I'm rather indifferent to the changes to the casters.

It does feel like their attempt at balancing was menial at best. Black Mages did not get a particularly useful buff, nor did Summoner's get a particularly strict nerf - both attempts seem like they will fail to balance the casters much. As for Red Mage, I thought they were fine where they were, and continue to be. However, I admit I'm not a raider, so I'm not taking that particular aspect of the game in mind, so I suppose my opinion isn't worth much considering.

Besides, people seem to be forgetting that these are preliminary notes, and changes to classes have been made at the last minute, and there is nothing preventing a change again come 4.21 or 4.25. Everyone really needs to calm down a bit and see how these changes play out before being too up-in-arms.