AT&T is facing a once-in-a-century challenge, and CEO John Stankey is pushing the company to "disrupt itself" and go hardcore to meet the moment. The telecom's sprawling network of copper wires is no longer suited to 21st-century demands for speed and mobility, demands that increasingly require new infrastructure of fiber optic networks and wireless spectrum.Stankey, who took the helm as CEO in July 2020, knows this. He's shown himself willing to do something about it — even if that means a sharp departure ...