It wouldn't die if enough people were convinced like the author that it shouldn't die.
How can there be demand if nobody is making it easy to use?
It seems like the incentive is missing. Browser developers have to prioritize what users use and what they know how to use. The author made the point that very few people even know what RSS is, and I think it's the content deliverers' responsibility to make users aware of that feature; there's only so much a browser can do to help with that.