I think the question here is not "is this an open question" but "are there people who disbelieve this?". I can imagine neurobiologists who cannot rule out epiphenomena about thoughts.
True, I can imagine that as well. I guess my question was really more about prevalence. How common are these people?
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
If continuing the discussion becomes impractical, that means you win at open threads; a celebratory top-level post on the topic is traditional.