4. AI will bring prosperity

The other side of the camp of AI is the AI believers who believe in a nutshell that AI will bring us prosperity in medicine, education, food production, material sciences, basically in any field where it is applied on. Finally, not all but some of these people even believe that we will merge with the machines by using brain computer interfaces or even replacing all neurons by silicon neurons. So with that out of the way, how much of this is actually true and what is actually possible ?