Your favorite sports team is massively overvalued right now. It’s not that you ought to be losing sleep over Jerry Jones’s or Mark Cuban’s finances—they were rich before and will be rich after. But the popping and cracking noises emanating from the key support beam in our Temple of Athletics—the TV sports business—foreshadow wild disruptions ahead for the world of sports. Like the barking dogs that sense an earth tremor before we do, ESPN’s annus horribilis is a harbinger of the Internet’s coming disintermediation of America’s half-trillion dollar sports industry. Just since mid-summer, the Disney-owned 800-pound linebacker of sports TV...