Zelazny also stated specifically that he did not want anyone else writing stories about Amber. Presumably the Amber Corporation would follow his wishes, or Jane Linskold , depending on what instructions he left for either the Corp of his family probate wise.
While the idea of a COG Amber adventure might be super cool, a number of the original fans have specifically avoided the (not so good) novels that were published after Zelazny’s death by another author.
Fans that I have spoken to have indicated they respected Zelazny’s wishes and would boycott non Zelazny approved products. The diceless , role-playing book was used with permission by Zelazny.