I doubt White Mages will be going back to their elements in the next expansion, aside from water which I think is technically present in cure magic (so 'not' that one lol). We could wager some gil on it, if the GMs dont mind.. and you're not mega rich lol. A few mil sure, triple digit mil and you're going to make me broke soon

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As for Celestial Stasis I am aware the wording makes it sound like time magic but given the context that spell came from Astrologer in FFT as a unique job where they had no time magic, and the only context was they were an astrologist, and that our astrologist lost all of it's other time magic spells I am therefore inclined to say it doesn't have to be in time mage's territory. Not that I can't see the argument that has to do with time magic (it says 'stasis' which sounds awfully time like lol), but I could also argue it doesn't, as they figuratively stop the stars, from moving (like spinning/movement on the axis), but not literally 'pause them in time' (the sun still boils, the stars still churn internally, they just stop moving on their paths- like planet's aligning doesn't mean they've stopped in time), and the fates that they read are held by this act (which is their power focus, the stars, doesn't
need to relate to time to pause the movement of which you've some dominion over).