A remaster/remake has positives and negatives, and people really need to keep in mind the negatives.

Here are some negatives:

Unless you play 100% vanilla, all those "things" you use would stop working and the community does not have the same drive it used to to make them work again.

They could have to censor the script of the game in many places, including completely redoing some characters. Bare minimum they would have to make some characters look older, since laws in japan have changed.

Many graphic assets would be demanded be changed by the ethics dept (a good example would be DRG and RDM armor, which is different for female players). Even in the past 10 years the ethics dept has gained more power, this would impact even FFXIV if it was "remastered" in this way, let alone a game twice its age.

Decisions they originally made, that ended up being a major headache would be changed. The importance of gil for instance has been often said to be a massive headache, that would change. They do not like dealing with rmt and the economy, so they would nolt do that in a remaster / remake (xiv is a good example, where gil is intentionally near worthless and they did this due to headaches dealing with it on xi).

The important thing is to remember they would not do a 1:1.