Millions of non-geeks subscribe to podcasts. Those podcasts are delivered, (notification of new podcast), through RSS. The user doesn't have to know they are using RSS. They just download install any podcast app from the app store or the play store and search for podcasts inside the app. The fact that RSS is what makes it work is irrelevant to them but it does make it work.

I suspect it also powers things like Flipboard and Zite (no idea of people still use those).