I agree with Bonfire, if the CTA finally accepts that Dorje Shugden is not a evil spirit and is a Enlightened Protector, with the support of China, they will be able to spread Tibetan Buddhism to all in the world. They would then might be able to get back their land as well, as China may think that they are really stable enough to be ruling a country by themselves.
There is only positive effect if the CTA join hands together with the China government. Some may say that it is because of the practice of Dorje Shugden, the Dalai Lama would pass away. But being realistic and thinking it through, how long more would the Dalai Lama be alive, if the practice of Dorje Shugden truly harms the health of the Dalai Lama, I am sorry to say but the Dalai Lama would have already passed away. Reason being that through all these ban of Dorje Shugden, we only see that the number of Dorje Shugden practitioners has increased and not decreased. Thus, if it really harms the Dalai Lama, I believe that the Dalai Lama would have already passed away due to the increase in Shugden practitioners.