Over 90 percent of the human brain currently serves no purpose, as is evident from the fact that many people with significant brain damage show no discernible adverse effects. So once humans begin to tap into this tremendous source of creativity and innovation, many problems that today seem insurmountable will be within our ability to solve.
The argument presumes, without providing justification, that the currently unused parts of the brain are a potential source of tremendous creativity and innovation is a flaw in the argument.