It's definitely a qualitative shift. I suspect most of the fundamental maths of neural network matrices won't need to change, because they are enough to emulate the lower level functions of our brains. We have dedicated parts of our brain for image recognition, face recognition, language interpretation, and so on, very analogous to the way individual NNs do those same functions. We got this far with biomimicry, and it's fascinating to me that biomimicry on the micro level is naturally turning into biomimicry on a larger scale. It seems reasonable to believe that process will continue.

Perhaps some subtle tuning of those matrices is needed to really replicate a mind, but I suspect the actual leap will require first of all a massive increase in raw computation, as well as some new insight into how to arrange all of those subsystems within a larger structure.

What I find interesting is the question of whether AI can actually fully replace a person in a job without crossing that threshold and becoming AGI, and I genuinely don't think it can. Sure it'll be able to automate some very limited tasks, but without the capacity to understand meaning it can't ever do real problem solving. I think past that point it has to be considered a person with all of the ethical implications that has, and I think tech bros intentionally avoid acknowledging that, because that would scare investors.