The Dalai Lama can not over rule three of his STATE Oracles regarding his Dorje Shugden ban.
To do show he would have to state that the Dharmapalas Dorje Drakden, Tsangpa Karpo and Tseringma were all WRONG.
The Nechung Oracle (Dorje Drakden) who is the number one State Oracle has stated in trance that Dorje Shugden is an evil spirit.
The now deceased Lamo Tsangpa Oracle (Tsangpa Karpo) who was the number three State Oracle has stated in trance that Dorje Shugden is an evil spirit.
The Tsering Chenga Oracle (Tsermingma) who is now a State Oracle has stated in trance that Dorje Shugden is an evil spirit.
All of them publicly took trance of their deity and stated that Dorje Shugden is an evil spirit in front of the Dalai Lama.
All three of these STATE Oracles had to take many tests to prove that they were in fact taking trance of these deities.
It was the Dalai Lama who OFFICIALLY RECOGNIZED them as State Oracles.
The Dalai Lama has stated that all the Tulkus and Lamas who teach Dorje Shugden are WRONG.
That all the previous great teachers were all wrong in their views about Dorje Shugden.
To lift his ban the Dalai Lama would have to now state that all three of his State Oracles and the deities that they take trance of are all WRONG.
The Dalai Lama CAN NOT lift his ban on Dorje Shugden.
He would have to publicly admit that he was WRONG about Dorje Shugden.
The only thing that the Dalai Lama has publicly admitted about Dorje Shugden was that he wrong in practicing Dorje Shugden.
So don't think that the Dalai Lama will over rule three Dharmapalas and HIMSELF anytime soon about his banning Dorje Shugden.
