It would be as if everyone had a cook but it could only put out bland, generic, but nutritionally complete, meals. Some people would tweak their home-cook to produce more flavorful, exciting dishes. Others would buy templates/recipes from people who wanted to spend their time doing that. And others still would just go to a restaurant where the entire process is handled end-to-end.
I do love straining an analogy. :)
I'll grant you that your future is possible. If "searching" via LLM for a tool just offers to build it for you, I'm not sure what that does to the software market. But I have a feeling that even with more people "building" instead of "buying" there will always exist a majority of people who don't want to bother with "building". Heck, there are people in this industry that I would never call a "builder" and there are plenty of people across all industries that simply don't have the drive/interest/etc in building, even when it's easier. I bet if you grabbed someone from the dawn of computing and plopped them down just pre-LLM they would be amazed and flabbergasted "Why isn't everyone writing software custom for their needs?? It's SO much easier than it was when you had to learn punchcards! The web (how very interesting by the way!) offers free courses to learn programming that you can do on the device you carry in your pocket!".
It seems that no matter how easy we make programming, there will always be people willing to pay others to "manage" that process. See also: YouTube has videos for anything you might need to do home-maintenance-wise, and yet the trade jobs are in incredibly high demand [0]. Perhaps with LLM + cheap robotics + unlimited/cheap energy this changes but we are still 2 parts away from that and even today's LLMs are just starting to show fruit w.r.t. controlling robots.
[0] PS: If you are leaving tech, go into this. Respond to people's calls, even if you can't get there _today_, respond and put them on a schedule. Use your tech skills to help automate/manage this. I've considered this every time I've needed just about anything done and gone through the miserable process of getting ghosted by multiple people before finally getting someone out.