I'm for Harry/Hermione, I just don't see how Harry can suddenly have a crush, as in bam right this second crush that didn't even take time to grow, on a girl he's barely spoken to. Show me proof that he talked with her during summer, at dinner, in the hallways, even in the common room - before he suddenly had a crush on her.
You find me proof and I might consider it. But really Harry and Hermione have been at each others side for years now. In those type of relationship's love usually finds it's way in.
I also think Ron and Hermione won't work out because they're always yelling at each other and putting each other down. Seriously if you think that's how "true love and marriage" happens/works then you need your head check. That's emotional abuse which is just as if not more damaging then physical abuse.
And I agree where does it say that any of the four of them end up married? For all we know Ron married Lavender and they all where just there as friends. :/