Many of those attempting instanced raids in the early stages tend to use advanced materia melding on accessories, which lead to tanks being required to meld STR or VIT. Due to this there were times where the melded accessories were better than the accessories which dropped from clearing the instance. In order to resolve this issue, in Patch 3.2 we will be making adjustments that will change the damage calculations of tanks into a more appropriate state.

As an overall plan moving forward, we will be making adjustments so that a burden is not placed on any particular role in order to challenge a high-difficulty raid.
Figured I'd put this here for reference.

In any case, the fact that the entire adjustment is being done to address a deficiency in dropped Tank accessories over melded ones is the main reason that people have assumed that the "change" will in the way we relate to our stats. The fact that they also singled out Vit and Str are pretty telling. In the end, they just wanted to make dropped accessories relevant to progression raiders instead of having them shell out billions of gill on melded stuff.

Whatever they do, I don't think it will really matter. The change will mostly likely be very small. People seem to forget that SE has to work within a pre-existing framework. They can't just go making dramatic changes to the way we relate to our stats without also dramatically changing previous gear sets or encounters in the game. They have to stay considerate of new players and old content.