IMO the web was made for discovery. I don't see why would people would want to consume what I write on Twitter or Facebook where there is no formatting available (or worse splitted in small messages on Twitter). If these people prefer to stay in their walled gardens, good for them, but I don't want to strip what I write to please them. Why won't a link on these platforms suffice since they have their "cards"?
Also if people want syndication in one place, there's still RSS aggregators which is a technology that works even if everyone like to pretend it doesn't.