Facebook does the opposite now, which leads people to use it as a content consumption platform rather than a social network. Obviously that's what Facebook wants, since content consumption is infinitely more profitable than people posting on each other's walls all day.
Yes, you'd have to manually curate some things, but otherwise I think it's mostly just a matter of not hiring any marketing people, and creating the features first and looking how to make them easily usable second. Especially if the goal isn't to "kill FB", but simply offer an alternative to those who want the good bits and actually like, uhh, reading manuals and being proficient with the tools they use.
They can't come if there is nowhere for them to come to, and then it's easy to pretend they don't exist. But they do, even among the old and young and not so technical.
AI can help with that. Facebook already has automatic alt text for images, for example:
* Image may contain: 1 person, standing, selfie and phone
* Image may contain: cat
* Image may contain: food
And for an end-user, simple filtering can help with that. I sometimes use the FBPurity browser extension to hide everything that's a link or shared post, leaving almost exclusively original content. It can filter on that automatic alt text too if you hate cats, but I don't mind frivolous posts that are original content from my actual friends.