Well, stackoverflow required competent users to participate. There's no need for that any longer. The "gap" will probably be addressed by LLM-designed tools that are only usable via LLMs and bigtech will be more than happy to put their own LLM-designed tools at work for their products, which means there'll be vendor lock at scale, so in the vein of the "digital realm emulating the analog realm" there'll be companies you'd have to specifically train for and none of it would carry over...
but this is assuming this current level of progress stagnates for at least the next five years. Sigh...
LLMs have used Stackoverflow's answers for training. Now, if people would stop going there for questions, people would stop giving answers, so LLMs would have no data to train on for new problems.
I think unless there's a reward system for contributing to LLMs, the internet will mostly be devoid of new content. People will move to walled gardens. All you need is a short demo showing how something like GPT-4 with the internet access plugin can make a profile of you based on your publically available comments.
but this is assuming this current level of progress stagnates for at least the next five years. Sigh...