Absolutely. It wasn't the child Snape was concerned about, but Lily. If it had been Neville he may very well still be a Death Eater. I think it's great that he loved Lily and all, but his love couldn't extend to care about anything but her- the things that are important to her not being worth it. And in a sense, he refused to change until he lost her. Despite the fact that their friendship ended because he couldn't do that years before.