I honestly think blue mage is fine as it is. You don't really use Vercure much as a red mage once you have a raid on lock, but that just means you're fulfilling your role as a DPS more. Does that mean red mage having Vercure was a mistake, or that it being a DPS was a mistake? No. But it does mean red mage couldn't really get better healing actions in order to avoid overshadowing actual healers.

Now apply this to blue mage. This is a job that can literally do anything, that would never fit into a single role like paladin, dragoon, or white mage. The blue mage would have to gear up, spells and all, for the role he or she would be playing. But once you've learned every spell and obtained your equipment, what stops the meta from being 100% blue mages? In order to fulfill these roles, blue mage would have to be able to perform as well as the rest of the jobs in the game, if not better. But add in spells like Level 5 Death (and let me remind you that no one who works for Square Enix has said whether bosses are going to be immune to this or not), and blue mage is a guaranteed "better" job because you can just one-shot the boss and be done with your raid or trial in five minutes or less.

Or, perhaps blue mage will be underwhelming compared to any other jobs, and therefore would be ostracized in raiding environments because people care too much about the meta to begin with. This is a game in which any job can clear any content, after all.

Simply put, this is not Guild Wars, and if blue mage is your reason for not playing this game, I suggest you just don't come back. This game has so, so much more to it, so if one little thing like this is going to ruin everything for you, I don't think you have the capacity to appreciate the whole. Now, if you're disappointed with blue mage, but you can still look at other aspects of the game without letting that get in the way, I've no problem. But I'm really just tired of how small-minded people are being.