If we're going off of usage stat trends, it's not going anywhere outside of RU anytime soon. Virtually no one uses it in UU, and in RU it still sees a really solid amount of usage and is no where even close to dropping, so it's probably never going to fall to NU. Considering the sixth generation is almost over, and we're starting anew with a brand new generation as Sun and Moon are on the horizon, we only have two months of usage shifts left and Aromatisse is probably never going to drop for the generation. Bottom line, if usage trends stay the same (and they most likely will), Aromatisse is going to be RU to stay.
So if you're looking to see Aroma drop to NU, it unfortunately is likely never going to happen, so wishing for it to drop is but a distant dream.