Despite the cool theme, this sounds utterly... bland. Mechanically.

And that's FFXIV's biggest problem: We factually only have one type of combat gameplay. There's no need to even have 4+ jobs if all they do is share 1 gameplay, so adding more and more on top feels utterly unnecessary. Just add skins/themes to existing jobs to do this, for example what you describe could, with marginal tweaks, just be a retheme of Dancer (theater, fluid, bursty already all present) or Red Mage (idea of mixing things from other jobs + sexy style).

FFXIV needs deeper changes first, and probably scrapping a whole lot of jobs to make the remaining ones truly deep in gameplay.