Imagine a Micropub client that could accept any form of feed (RSS/Atom/JSON/h-entry/etc.) as an input and publish the content to your personal website.
Then any silo service (Soundcloud, Goodreads, Flickr, etc.) with such feeds could be used to syndicate all of one’s content to their own personal website with reasonable fidelity.
I’d love to see services like IFTTT, Integromat, Zapier, etc. provide this sort of service. Using the individual APIs they’ve already got, they could provide higher fidelity of content mapping (eg. tags which many feed types don’t support) to people with their own websites.
Social media services that have widgets that people can embed into their websites should pivot to this sort of model for publishing their users’ data. They could still serve as discovery clearinghouses/hubs and serve ads. This would help make them less dependent on the major corporate social platforms like Facebook, Twitter, and Instagram for ancillary distribution and engagement.