I like that idea as well. It seems the JK has made Ron as a character that she would not have die because he is based on one of her friends. But I believe that she did that to make everyone have a false sense of comfort with Ron. Ron and Hermione will probably try a relationship, at some point Ron will either die, or he will mess it up and Hermione will turn all of her attention to Harry. Harry will be with someone at the time and then realize his intrest in Hermione. I can't see him trying anything with Loony Lovegood, but look at her name. If/when they do get together it cant last long because every intimate moment would be a comic scene as well. But a very good thought that you brought up.