RSS never died. On the contrary, its usage for content aggregation & monitoring has been increasing over the years, specially in the business world and niche markets.

I'm speaking from my own experience running a growing & profitable startup, Feedity - https://feedity.com, that helps with custom feeds for unstructured sources like webpages.

Our upcoming API and content explorer (a different kind of 'feed reader') have received thumbs-up from some customers who opted for early-testing.