Speaking at Goldman Sachs' Communicopia Conference in New York this morning, Comcast CEO Brian Roberts said certain "pivot points" over the last several years had allowed the No. 1 cable company and NBCUniversal parent to get where it is today "at the intersection of technology and media." He marveled of the recent Rio Olympics on NBC, "We're really proud as a company to have broadcast that." Technologically, he called it "a home run." It was also "the most profitable, as…