He won't change because society considers him to be a prodigy (for good reasons, see his early work) and he lives in a cloud of success from where its hard to empathize with how most developers or actual users of his tool work. In essence, he found great success with a business model for software appropriate for his time and has done well enough to not have to change anything.

Although, perhaps this step is kind of a result of stagnating growth, IDK.