Here's a scenario: You don't pay for cable TV, but you love sports. And you hear that ESPN will now let you buy a streaming version of the sports channel. So you sign up, for $30 a month. And here's an alternate scenario: You pay upward of$100 a month for cable TV, but you're really only doing that so you can watch sports. So when stand-alone ESPN comes along, you drop your cable subscription and move to ESPN's $30-a-month plan.Both of these scenarios are good for ESPN owner Disney. Either way, the compan ...