Nechung has already "lost" his power. His predictions are no longer accurate and will never be accurate again as there are even rumors that the "Nechung" that takes trance in the oracle is not Nechung but the spirit of Ngatrul Rinpoche who attempted to murder the 13th Dalai Lama with black magic but was caught and sentenced to a painful death and because of that he exacted revenge by impersonating Nechung and giving inaccurate predictions. So it means one thing: Dorje Shugden's time has come and the ban is only probably a temporary measure to spread his name and plant imprints into the minds of others before he goes global.
Personally, I do not believe that Ngatrul Rinpoche's spirit is impersonating Nechung, giving inaccurate predictions. I believe that these wrong advises that were given by Nechung and the Dalai Lama is to spread Dorje Shugden to more people in ways that we may not understand now. But if we continue to do what we do, and go with the flow of actions here and there.
This is because since Nechung is the one to help in the manifestation of wrath for Tulku Drakpa Gyeltsen. Allowing him to pass on emanating himself as our protector, Dorje Shugden.