This will never ever happen for as long as XIV is XIV.

There's a decade of content built and balanced around the server ticks. They'd have to redo it all. It would require an entire code rewrite.

In a recent interview, Yoshi said something along the lines of "I don't know if you realize you're asking for an entirely different game" when asked about boring combat. While that's not very relevant in the context of "please bring back team resource management, aggro management, and get rid of the party buff meta", it's extremely relevant when you're asking this question.