Most people believe that a scenario in which a new dominant species arose and possibly wiped out humanity to be a terrible thing. This is natural as we instinctually fight as hard as we can for our survival.
For the last few millions of years though our ancestors have evolved from one species to the next, each new version better fitted for survival and more competent. If you look at it from a larger perspective, AI would just be a new species birthed out of our own. AI could be our cosmic children, birthed to spread higher and higher versions of life through the the universe.