I could say that given time and research, anything is possible with technology. However, I think this is a question that we cannot answer yet, at least, not until we can come up with a unified theory of consciousness. 

At the moment, researchers, scientists, and philosophers are all divided on a unified theory of consciousness. What is consciousness? Is consciousness knowable? Can it be measured? Can it be reproduced? And if it can be reproduced, can we transfer it to a machine? How do we transfer it to a machine. At this point in time, we haven't even answered the first question. What is consciousness? 

So, unless we can know that, we won't have any definitive answer to the question can robots become conscious one day. On a personal note, I don't want robots to become conscious in the future. I've seen enough sci-fi movies and TV shows to know that is a bad thing.

Source: 

Scientists Closing in on Theory of Consciousness. https://www.livescience.com/47096-theories-seek-to-explain-consciousness.html