What is your benchmark for success? A brain chip that can augment reality? In my opinion the real potential for a brain chip is more of a technology to expand accessibility to people who can't control their bodies. Also in my opinion, no one should trust Elon Musk or anything he makes so Neural Link I don't think highly of. The potential to provide people with severe mobility challenges another means to interact with the world is something worth developing. That I can see happening in a decade or two. A general purpose brain chip, yeah a hundred years plus, if ever.