This would be a largely positive solution for humanity, as long as AI remains "just an assistant". I don't think that we are heading that way. It's possible that, at some point, when the time you save becomes comparable to your full working week, your employer (or your clients, if you are self-employed) will discover that you are just a proxy between them and prompting directly the AI. Of course, if your job involves physical labour or requires physical presence or taking legal responsibility for something, you'll be fine for a bit longer (well, comparatively fine in a society plagued by widespread unemployment and social unrest).