As is clear from his musings about art, for Deidara, permanence holds no merit. He values the temporary, the transformation. I was trying to figure out what might be Dei's reasons for joining Akatsuki, since there's no way someone like him actually gives a damn about world domination. The maintenance of a world order is not something for which someone interested in the fleeting would care. However, the radical turnover of society and explosively unique manner in which Akatsuki plans to achieve their goal are sure to appeal to his aesthetic ideals. So he probably could care less about phase three of the plan, it's the second part that's an ultimate work of art for him. Assuming this is Deidara's motivation, then, theoretically what would he be likely to do if Akatsuki is successful? I can't see him sticking around and working towards stability of any kind. In fact, I can see him turning around and working against Akatsuki, in the name of art. It's unlikely that Akatsuki's plan is actually going to succeed that far, but I think that if it does for some reason or another, they'll be at least one traitor within. Any ideas?