No TP in Shadowbringer Expectation

[Kazrah]

massive job overhauls has been a staple of expansions anyways

Not every expansion in this game. Heavensward only saw anything close to a job overhaul for Bard becoming "the bow caster" and Ninja getting its own gear type apart from Monk, and that was pretty much it. The only reason why Stormblood needed "massive job overhauls" was because at some point, devs needed to create an extra resource for each job to serve as a foundation for any future abilities. Since Stormblood got that bigger factor out of the way, Shadowbringers would most likely be on par with Heavensward in terms of what changes jobs get.

If TP were removed, it oddly wouldn't be as big a deal as players would think since any spell or weaponskill with a primary resource cost relies on a base percentage of that resource. Those percentages would just translate over from a percentage cost of base TP to a percentage cost of base MP. If anything, the biggest impact might be some melee jobs wanting Piety, which would be kinda funny.