Imagine starting a post, and then checking a box:
This is a thread: ☑️
Then you write out the multiple posts in the thread and submit them.
Then someone comes along and wants to view your thread.
There is a button that says: [View as eBook]
You press it and a Modal window pops up, where your thread appears as flippable pages.
I can see this happening in the future, and I can see a huge boost for any platform that adopts it.