XIV classic (pre ARR) will never happen, and I say this as someone who played back then and didn't hate it. I actually liked some of the old mechanics more than some of today.
It will never happen because they didn't preserve much of 1.0~1.23 that would allow them to just put some instance of it up and running easily. And to try salvage what was left would cost time, effort and resources that simply doesn't justify giving customers access to an iteration of a game that from the eyes of the company was a critically low point in their business life.
