Maybe social network addicted people may not recognize but there is a whole world who use email, instant messaging and other stuff like feeds to communicate, which are very established and not beholden to whims of any single moneymaking scheme.
Feeds are a very simple and open idea. Inability to put a toll booth between the communicating parties doesn't mean feeds are useless or dying. It just means you are unimaginative. Browsers may chose to hide the functionality out of a desire to idiot proof their software but it doesn't mean people who have an attention span more than a goldfish have no other ways to subscribe.