“The good news is that I don’t think there are any significant barriers to creating one, should it become necessary.”
IMO the standard RSS reader app is Reeder on both the desktop and the iPhone/iPad. If I were them, I’d be building out the server as well as web version that would easily grab everything from the apps to help users switch from Google . They could also dominate the space by making the web version a friendly looking version of Google Reader. Reader is the best RSS platform but it’s interface isn’t. Who ever wins that would win the war.