It shouldn't have come to this, the doctors said. Players and coaches are lamenting the loss of a college football season. Fans are disappointed and pointing fingers in several directions. But to medical experts who have for months urged society to take the necessary steps to mitigate COVID-19, Tuesday's Big Ten announcement of the cancellation of fall sports felt like an acknowledgment of reality and of failure. On a Zoom call Thursday, Dr. Brian Hainline, the NCAA's chief medical officer, said that when experts began talking in April about a timeline for returning to sports, the expectation was that COVID-19 cases would decline in the following months and that protocols would ramp up...