Shares of Disney, which have hit record levels as the company consistently beat forecasts in recent quarters, dropped 2.5 percent in after-hours trading on Thursday. With the TV landscape rocked by a wave of new online viewing options, Chief Executive Bob Iger bucked the trend and insisted Disney would not rush to offer standalone subscriptions to popular content such as its sports behemoth ESPN outside the traditional bundle of channels sold by cable and satellite operators. Disney will experiment with online offerings, Iger said, including ESPN’s planned streaming service of some NBA games.