No, I'm about as convinced as I ever was. When I first read HBP, I was convinced that Severus was a goner, and would give his life to save Harry's. But then I thought about it some more: what is the real conflict in these books? Why are Harry's eyes emphasized so much? How did Harry and Lily defeat Voldemort in the past? What does Voldemort, himself, represent? When I'd thought out my answers to these questions, I became certain that I'd got things the wrong way round initially. Severus is not going to die to save Harry; Harry will die (or at least offer his life) to save Severus. I would put money on this, and I'm not a betting person.

That said, I would be really happy if Rowling could manage to save them both in a way that was convincing. But I can't imagine how she would pull that off.