Ghost may or may not. But it's not a real CMS. Ghost is a cms in the way blogger is a cms. You are limited to the functions of a blog.

WordPress has a lot more functionality, can be used for stores, forums, social networks and more.

Will ghost take more market share. Probably due to the fact most basic users are after a blog and nothing more. But WordPress wins in the enterprise sites who are looking for a lot more than just a blogging platform.