The capitalization is in fact correct, being pretty much the only way we can represent an emphasis in an article title (markup does not get parsed as such if you include it). That said, there would be little lost in your rename.
However, the reason I reverted your rename is because we do not permit users to change page names at whim. Page name changes are Serious Business for many reasons, and the proper procedure for doing one is to propose it -- and provide the reasons you think it is a good idea -- in the Trope Talk forum. It will be discussed, and we will get a consensus on the proposal from those users who contribute before we do anything. In the future, please follow this procedure when you feel a page needs a name change. Thanks!