Would it feel like Blue Mage to you guys if the White Wind spell was a Heal all type of spell, like Medica, instead of a spell that cures based on the HP the user has?
What if Bad Breath was just a DoT+vulnerability debuff instead of inflicting a bunch of status ailments (that have varied even in different FFs)?
What if Death, instead of one-hit-killing, just dealt massive damage (and maybe could be used to kill enemies outside DF)?
What if 1000 Needles, instead of doing always 1000 damage, just dealt damage in a regular way (or maybe could just deal 1000 damage and just be accepted as useless in end-game, which is probably the way they'll do it anyway)?
I don't think that, by saying "If Death was too difficult to implement, we could accept if they didn't include it", is suddenly accepting that they take away everything else that a Blue Mage is. As was said before, even the Blue Magic spells' effects have changed from different FFs and some only appeared in some. Would it be that unreasonable to adapt them to FFXIV and not include everything? You still have a lot of iconic spells that could be included easily as damage dealing spells (with any other properties that they could decide to add for job mechanics), like Goblin Punch, Matra Magic, Aqua Breath, Flamethrower or as support spells, like Angel Whisper (to Raise) and Mighty Guard (to add some defensive buff to the party).
I think there is so much that can still be done even within the limitations of such a different game like FFXIV. As was said before, even Thunder is different than it used to be. Blizzard, Fire and Thunder was always the holy trinity of Black Magic. They only differed in the element, everything else was equal. Now they're all different, with Thunder even becoming a DoT. But it still feels like a Black Mage. It still has the three elemental spells and they're all important. They even took other typical black magic spells from it, like Bio, Aero and Stone, giving them to other mages. And I think it's still good.
Heck, Red Mage doesn't use the same Fire that Black Mage uses, as was usually the case. He has his own version of Fire, Verfire, and the same for his other spells. Some might think it doesn't work, but I think it's pretty faithful to what a Red Mage is. He uses Black Magic, White Magic and a sword. If Blue Mage also used "modified" versions of monster spells like Ver-Bad Breath or Ver-Death, it would be reasonable to me.
I don't necessarily dislike the idea they're going with, I'm pretty open to the idea of enjoying this limited job thing, I just think the excuse of "it's too difficult to implement Blue Mage as other jobs, so we'll make it its own thing" is giving up on something that doesn't seem that hard to do. But well, I'll wait and see.