This was been talked about many times during the earliest day of Bitcoin. And mostly asked during the bear season. Many people are asking and assuming "What IF", some will say it can be possible and of course, I can agree with that but to know when that is impossible. But, I don't really think about it, not in my mind it becomes zero because I see the increasing demand and market adoption making it hard to devalue and turn to zero.
Many people can draw that assumption but no way they are absolutely right, they can be wrong as well( in most cases).