Two things about that: We're probably quite a big distance away from making machines that think, and when we do, that achievement will be debated. It will be debated because, intrinsically, it will end up proving the Eliminative Materialists right. But everyone who isn't an Eliminative Materialist will say "That's not thinking!"

[EDIT for more depth] If thinking is emergent, we'll eventually make a machine that thinks. Unless you think we have imbued it with a soul, there you will have an example of a materialistic basis for thinking. As a side effect of showing a materialistic basis for thinking it will probably also overturn a lot of psychology, and demonstrate that how we think we think, and even what we think we think is wrong.