GE & Comcast, lack of confidence?

GE and Comcast are discussing a $30 billion deal to sell just more than half of NBC Universal. GE has been trying to get out of the media company because it is less lucrative than jet engines, housing and military contracts. But it seems like Comcast is less than thrilled, offering barely half and wanting an easy out in three years.
http://www.reuters.com/article/newsOne/idUSN1214454620091012