I agree with this view 2 Marvolo. I think the fact that in the book itself King advises us to stop before we read the ending shows this, and yet we choose to continue and enter the Tower, just as Roland does. So I think he is definetly trying to show us as readers that we shoulden't rush books to find out the ending(which I have to say i'm guilty of myself!
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I also agree with the view about King himself, and his struggle to finish the books, its a good message overall, and i'll certainly take it into account in the future