Maybe MRSS has a chance. I am old enough to remember the first go around at all this. I remember reading an article during the 1990s on O'Reilly about RSS, semantic web, etc. I used to read Dave Winer's blog pretty regularly. I remember being skeptical at the time and it turns out my skepticism was prescient.
Nowadays it seems common to generate MRSS feeds for podcasts and video playlists. Devices like Alexa, Google Home, etc. are taking advantage of this format. Instead of it being used to "free-the-web" it is being used by content aggregators to ease vendor lock-in. This lock-in could not be achieved with textual content (where it is easy to write a competing application) but it can be achieved with hardware devices.
I'm even more cynical now than I was in the 1990's. I do not see content creators providing unfettered access to their content. The whole point of vendor platforms like Facebook and newer devices like Alexa is that the content is marshalled by the platform NOT the user. Content creators will give that ground to another corporation that they can negotiate with but I don't believe they will ever give it to users directly.