I have a student in this gray area. Dad wants her to be hearing. She does do better when sign language is incorporated. She is very ASL when she signs. It is natural for her.
She has an interpreter for Social Studies/Science and I am with her during the Language Arts block.
I have always felt that ASL is a very normal and natural thing for Deaf and HH kids. I have worked with kids as young as 3 who are natural at ASL. I don't have a concern for those kids. It is when they are pushed into the hearing world if that is not where they belong. That is my concern for my one student.