Neither Google nor WA are good at understanding the semantics behind a natural language question - something that Watson has been designed to do. Also, showing the percentage of certainty, as they do for medical queries, could be useful for many fields, particularly for academic research, given that they include citations, something that should be easy to include. I'm seeing Watson rather as a tool that could make a dent in specialist fields and trickle down from there, as the hardware to do that becomes cheaper.