Olivia's career is heating up and she is getting more and more movie roles, which is causing her to not be on House MD, I think it is time for her to move on, and they should keep Amber Tamblyn.

http://www.showbizspy.com/article/226512/olivia-wilde-the-next-angelina-jolie-actress-olivia-wilde-tipped-for-tomb-raider-role-again.html