OP, I appreciate for the post but you have not said anything that has not been stated here before. I think one important thing to be considered in a post should be conveying the main message to the readers then other things can follow. Every writing should be well structured in such a way that after the message is conveyed there will be room for more conversations and interesting dialogues.
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The writing skill of people are decreasing nowadays. There are no many people that wants to be professional writers, rather they want to be content creators. Video and audio is making more waves in the social media. I have read somewhere a user suggested that there should be a patch script to accept audio in the forum. If such a thing gets implemented in the future, you will understand that not many people will like to type anyone, rather they will prefer audio or voice note.
I would not take anything away from video creators even though I think you have a point from the fact that lots of people don't want to write anymore, and that has to do with the consumers interests and not from the producers, people are shying away from reading, the Library is the less popular place in the city and the gaming zone, cinemas just to mention a few are hot spots that's to tell your people's interests that's why content creators and the rest are taking the advantages but regardless the do lots of writing behind the camera's to make it perfect if not them doing the work then their production team.
I dont think people are shying away from reading, the only thing is that people are now more interested in listening to audio books instead of paper books. We are in the digital world so if you would want to retain your customers then you have to digitalize any thing your doing. When it comes to reading even blog sites like medium has an audio button for listening articles and blogs.