The first point (analogizing the hard problem to the reaction to Darwinism) is a very common rhetorical move: an analogy and history of ideas, which is convincing to many people, but what does it prove? > A philosophical zombie would claim to know what subjective experience is; otherwise, it would be empirically distinguishable from a human. Chalmers’s point is that the existence of the hypothetical, irreducible cons…
The hope for resolving this, I think, is that once we understand all processes in the brain, there will be some process that clearly is the self-referential "person" that is produced by the brain in normal operation. Anesthesia is strong evidence that there is some physical process that is the person.
The hard problem only really needs consideration if we get to a point as you describe, where we fully understand everything happening in the brain and cannot assign consciousness to any part of it, even though we can turn it off and on again (e.g., with anesthesia).