There are only so many chairs. Disney's internal reorganization has claimed its first high-profile internal head.

Who's out? Disney Media Networks co-chair Ben Sherwood told staff in a memo obtained by NBC News that Bruce Rosenblum, who joined Disney as president of business operations at Disney-ABC TV, is leaving the company. Rosenblum was once head of TV at Warner Bros.

Who's in? It seems that the creation of a new direct-to-home division run by Disney's Kevin Mayer meant that Rosenblum's role was no longer necessary, according to a source familiar with the situation who was not authorized to speak publicly. Rosenblum will also be stepping down as a board member at online video platform Hulu, with Mayer taking his spot. Mayer also takes over his ad sales purview, while Sherwood is getting responsibility for distribution deals with cable operators.

What does it mean? As the Wall Street Journal points out, Rosenblum was brought in to free Sherwood to focus on creative execution. Where Fox's well-regarded production chiefs Dana Walden and Gary Newman will end up remains a question. The two just extended their contracts another year. Of course, the big caveat here is whether Comcast's planned bid pushes Disney out of the picture.

The known unknowns... The proposed Fox/Disney merger means plenty of uncertainty for executives and well as creatives. The deal already resulted in high-powered TV producer Ryan Murphy joining Netflix.