No, I don't think that's true. What will instead happen is there will be expert humans or teams of them, intentionally training AI brains rather than expecting

No, I don't think that's true. What will instead happen is there will be expert humans or teams of them, intentionally training AI brains rather than expecting wonders to occur just by turning the training loose on random hoovered-up data. Brainmaker will be a valued human skill, and people will be trying to work out how to train AI to do that, in turn.