Autistic people are not sociopaths, they are not incapable of empathy or love, they just struggle to understand when you're expressing it, or to express it in appropriate way.
Your fear of being unable to communicate with your child is valid, but autistic people are not "broken".
It's not a nice thing to say or admit, but it is .. well, true.
I have an autistic uncle who is not profoundly so, but is hard to communicate with and has problems existing by himself, often getting into trouble that is hard for the rest of the family to understand the logic of.
Autistic kids are demonstrably not "incapable" of empathy as commonly understood. They may be impaired in their expression of it, but that's something quite different.
I should say-- I think it's often PDA misdiagnosed as ODD. Which is very sad for those ASD kids not getting the help they need (because the "treatments" for ODD are probably not going to work well on a PDA kid).
Indeed ASD people often suffer from extreme empathy e.g. towards animals or something upsetting on the news (war/famine/etc.)