To clarify my comment: obviously text will never be "obsolete". But I worry that some day when you search for something like "how do you reverse a linked list", the most popular results will no longer be well thought out articles, perhaps with good use of pictures, and maybe animations when necessary. Perhaps in the future the most popular results could be a video, perhaps also well done, but advertised with clickbait and constant "like and subscribe" and "sponsored by <some product>".