That's a very limited view. Given the last hundred years of technological advancement in every possible field of science and engineering it's difficult to believe that anything is impossible. I don't think artificial sentience is as much a matter of "if" as it is "when." We've only really had computers for 60ish years, and widespread computer use far less than that, and look how far it's come. Our knowledge and technology is advancing at an accelerating rate, there's no telling where it'll go. This is a very exciting time to be alive.