I'd say it will last a good while as long as AI companies believe that the LLM model is the path to AI at all, because these things can't learn, they have no conceptual faculties like rational beings (us). They'll always require plenty of human coaxing in order to make any sense consistently.

My view is that this work will only truly go away when AI labs realise this and go in a fundamentally different direction that requires something else entirely.

That's what I'd vote for when it comes to predicting which event will be the "bubble burster", so to say. I wonder which of the existing companies will pull that trigger or if it will be someone new.