I am not just talking about TES games for their style, but also Sea Dogs, PotC, and their CoC game. Also they have already stated that they are going to use the same styles they feel comfortable with from their previous titles in interviews about the subject. Going by the statements that have been released by Bethesda one can easily come to the conclusion that they have no interest in making Fallout 3 recognizably Fallout.
I don't deal with hope. I go by what information Bethesda developers have officially released in interviews and the style of their previous works. Hope in one hand and crap in the other. See which one gets full first.