Honestly, I really can't see them adjusting the drop rate on the items at this stage of the game, but I could be wrong. I mean, look what they did with Dynamis after all. Even though they adjusted the drop rates and totally revamped the system, the key point was that they made the event much more accessible to solo and low-man groups which is why it's become so successful.
If they make Voidwatch more accessible to low-man/6 man groups, I think you'd definitely see an increase in the number of people doing it. People would be farming more for the Empy upgrade items and the equipment would be a secondary.