Basically agree with your (A) answers, though I'd also add that even if a person hadn't read GEB, they could also expect that a long-lasting following for a book is more likely for a good book.

As far as (B), it cashes out for me into a complex of descriptive and normative claims. Among the descriptive claims are that it is possible for someone to excel legendary band X in their own genre (it would be hard though not theoretically impossible to find a good judge of genre quality who wasn't biased by knowing the legendary band).