Not sites that are solely driven by ad revenue. Most sites that aren't, still offer an RSS feed, it's just not always visible on the page. Some sites I've subscribed to and contacted for minor RSS related issues, didn't even realize they had it, it was just part of the publishing platform they used and the feed was exposed through a link tag in the markup. I don't think the protocol has anything to do with the choice to provide a feed, in fact, yet-another-protocol would just make it a harder for everyone involved.