If they bought Disney, which I don't see happening, they would probably sell off the parks and resorts division.
While we park elitists may hate the idea of 'synergy', it's because of that synergy that I don't think any entity would break up the parks from movies/TV or any other part of TWDC where you would have that synergy. Why keep the movies and sell off all the rides and attractions which help advertise the movies? With 'synergy' the two parts are worth more together than separately. No company would purposely devalue their property that way.