I suspect basic HTML won't change much if at all. We're still using tags like html, head, body, title, h1-h6, p, img, etc after all these years, and I don't see them going anywhere.<p>Of course, unless some sort of weird tech shift happens that makes the browser obsolete altogether, I suspect most HTML/CSS/JavaScript won't ever change anyway. Browsers are backwards compatible to a similar degree as Microsoft and Windows. If even stuff like the center tag are supported in 2024, most things aren't going anywhere.<p>On a less specific note, I guess poor planning and software development practices? Feels like planning how long things are going to take hasn't got much better in the last few decades, with things like 'agile' barely making a dent in it. I suspect projects overrunning, feature and scope creep, big budget disasters, etc will probably be issues in society til the end of time.