I have to agree with JJ2. RSS isn't going anywhere. It's too widely used in the plumbing of the 'internets'.
RSS readers have always been a user-driven requirement and clearly they aren't surviving the changing face of internet-mass-adoption.
The success or failure of a 'Feature' such as a built in RSS reader is a huge topic out of the scope of this discussion.
Having said that, RSS, the read API for content, and the people who want to use it directly will always be served; just now as part of the long-tail, not the mainstream user community.
No worries