This is a problem of understanding, not science:
The question "Will robots ever become just like humans?" implies that if robots were to become "just like humans" they would still be robots. They would not; they would be humans.
One might also ask "Will apes ever become just like humans?". No? What if they were smarter? What if they had human emotions?... What if they had a few years to evolve?
The original question is inherently flawed, which is why it may seem challenging. A less flawed question might be: "Will robots, or the (logical) descendants of robots ever have characteristics similar to those seen in humans, such as intelligent thought or a sense of emotion?".
With the fuzziness removed, the answer, barring premature eradication of the human race, seems obvious.