WHEN? will always be the question of when the ban is going to be removed?
Why would he remove it? He's not going to because he wants the ban to stay in place for political reasons.
Politics change. Political agendas change. Political directions change. Nothing stays stagnant. Politicians change. So the ban can and will change.
The Dalai Lama has changed so many times within the last few decades:
First, he was pro Shugden and even composed a prayer to him,
then, nechung purportedly stopped him from taking sogtae from Trijang Rinpoche
afterwards, the yellow book was used as an excuse to demonize Shugden
Then he said that Dorje Shugden was shortening his life
and now, he says whatever we chose to practice, it is up to us
so next, would it be that, he apologizes and says that Dorje Shugden is an enlightened Buddha after all?