Considering TP is only ever an issue right after a rez or when you maintain aoe attacking due to how much they've nerfed TP costs over time, it's basically useless at this point.

I doubt they'll do any changes to MP or how spellcasters work, merely keep everything that used MP before continuing to use it in Shadow Bringers, and just wiping TP out completely. I'm more interested to see what they'll do with the spire as a result of this; goad/BRD TP refresh to a lesser extent since I think those might just be straight deleted.