Philosophers can argue until they're blue in the face, and scientists can uncover all the evidence they want, but they can never completely convince us that the body and the brain are machines. The final proof will come only when engineers manage to construct machines that are just as complex and miraculous.

This statement may be interpreted as

• We shouldn't update until we see this final proof - bad thinking

• A large number of people ("us") won't update until they see this final proof - probably a true statement