My issue with the entire Blue mage discussion probability, is that I can only see it become a dps. And I doubt they want to further increase the dps classes pool, considering RDM is the dps class for the expansion. Blue mage as healer/support seems very odd. I can maybe see it as tank. Unless they start walking away from the holy trinity system. And create a hybrid class.

Dancer as healer/buffer is more likely. Especially if it's a class related to ala mhigo. But again, so can be blue mage. There are so many mixed signals that it's hard for me to 100% say "oh it's going to be this!".

I personally think Yoshi-p is at least doing a good job at making us guess and second guess ourselves. Props to that, it will only make the eventual unveiling all the sweeter.