The Karmapa being the potential next leader to replace The Dalai Lama, perhaps this is a way for The Dalai Lama to get him involved with the ban of Dorje Shugden. Eventhough, both Karmapas have wisely remained silent on the mattter.
The Dorje Shugden ban... What a poisonous gift for The Dalai Lama's successor...
1. Well, to make matters more complicated, there are two Karmapa's now (see Big Uncle post)
2. the Karmapa is not Gelug, and if the Dalai Lama did not succeed with the ban with his title in the Gelug sangha, how could the Karmapa possibly succeed.
3. Why would the Dalai Lama set his successor to "fail"?
I doubt that the Karmapa will become the next major Tibetan buddhist figure after the Dalai Lama passses away. In fact, it makes more sense to me that a Dorje Shugden's propititator lama will then become the next worldwide Tibetan lama figure. Dorje Shugden is more and more famous everyday, his recognition is growing. After the Dalai Lama's passing, the Dorje Shugden ban propitiators will become marginal, and I am convinced that Ganden and Shar Ganden will reunite under the protection of DS.
The next Dalai-Lama-like figure must be a strong defender of the doctrine of Lama Tsongkhapa with full recognition of Dorje Shugden as the Protector of this time and a Buddha for millions to connect with.
And that lama will also show immense and sincere deference to His Holiness the 14th Dalai Lama, who, in fact, paved the way for Dorje Shugden to take over.
Dorje Shugden has in the Dalai Lama his strongest ally.
This is what I think, this is what seems most logical.