I think that part of the reason that FFVI, FFVII, FFVIII, FFIX, FFX were in the booming season for the series are from their epic spells/summons graphic. ( I wanna skip out FFXI~FFXIII because it went little off the trend) I think that what FFXIV really need are kind of cool-epic spells that will let people says "wow!" when they first seen it.

However, the epic spell shouldn't be too easy to use. It should have some additional requirement such as TP (so that you can use this only if you not use Second wind often) or very long cool down and huge MP consume (but I dislike this idea, because it will be too similar with 2 hours ability)

Personally I think it is nice for mage to have some other use for TP other than just saving for second wind. But any choice will do it, if SE would bring us some epic spells graphic into the game. ^^