The issue with fire 2 and flare is that, until 68, fire 2 is absolutely part of your aoe rotation. I'm all for Flare replacing it, but the aoe rotation will flat out need to be redesigned. Which I'm also all for because it's a bit of a mess between 50 and 72.

As a note, Enochian can also be rolled into fire/blizzard 4. You can't F4/B4 without Eno-chan, so it just makes sense.