If we believe that Von Neumann interpretation is correct, and that metaphysical materialism is indeed false, what will be the alternative research program? As far as i can see you'd still need to try to build a conscious machine and fail to prove that the assumptions were true.
But i don't agree that metaphysical materialism has been repeatedly demonstrated to be logically false. As for quantum mechanics, i find Lee Smolin's argument that there must be deterministic and computable theory behind it, very compelling https://www.amazon.com/Einsteins-Unfinished-Revolution-Search-Quantum/dp/1594206198.
> Why on earth do you think scientists are only interested in consciousness in order to make conscious machines??
What other method do you know to understand and use something? Science always builds models of things it is studying.