Because in a shrinking market experiece + AI is vastly superior to little experience + AI.

Experience is becoming more important, since experience is required for the tasks AI is very bad at. AI is drastically increasing the barrier to entry, since it can do many of the things entry level people are/were useful for, but it can't do any of the things experienced people get payed for.

ChatGPT can not tell you which API changes to your 1M SLOC code base are helpful for the future interests of your corporation. It won't talk to management about technical challenges in demanded features or which hirings are neccesarry to be on time with future projects.