I knew how the Lord of the Rings movies were going to play out but I still enjoyed them (well, not so much the last one).

I think the fascination comes from the fact that it's a story that in ASOIAF is in the midst of passing from recent history into legend. We just have the warmed over, romanticized highlights to go by so everything is larger than life. Of course it's our nature to not just leave it like that but to want to pin it down and suck the marrow out of the story's bones.

You may solve all the mysteries for us but you won't have us get to know Rhaegar, Lyanna, and so on the way we know the characters in ASOIAF. We want to see the Tower of Joy acted out in the same way we want to see our other favorite scenes from the books acted out.

I think it's better left to the imagination, but if you build it they will come.