Only fools will opt into Musk's integrated AI. The truth is that they are handing over complete control of their mind and body.
In 1965 Hose Delgado demonstrated stopping a bull mid charge by controlling the bull's motor functions with a brain chip (the video is on youtube). Today's capabiliity is beyond belief but I believe, as Random Rants said, we will evolve...that's part of human development but freewill is underestimated by most...fear takes over and freewill forgotten, courage is certainly in short supply these days.
Personally, I doubt there will ever be brain technology that can control a person who knows they are made in God's image and relies on that power within theirself.