Sure, it's obvious, but it's only one of the missing pieces required for brain-like AGI, and really upends the whole LLM-as-AI way of doing things.

Runtime incremental learning is still going to be based on prediction failure, but now it's no longer failure to predict the training set, but rather requires closing the loop and having (multi-modal) runtime "sensory" feedback - what were the real-world results of the action the AGI just predicted (generated)? This is no longer an auto-regressive model where you can just generate (act) by feeding the model's own output back in as input, but instead you now need to continually gather external feedback to feed back into your new incremental learning algorithm.

For a multi-modal model the feedback would have to include image/video/audio data as well as text, but even if initial implementations of incremental learning systems restricted themselves to text it still turns the whole LLM-based way of interacting with the model on it's head - the model generates text-based actions to throw out into the world, and you now need to gather the text-based future feedback to those actions. With chat the feedback is more immediate, but with something like software development far more nebulous - the model makes a code edit, and the feedback only comes later when compiling, running, debugging, etc, or maybe when trying to refactor or extend the architecture in the future. In corporate use the response to an AGI-generated e-mail or message might come in many delayed forms, with these then needing to be anticipated, captured, and fed back into the model.

Once you've replaced the simple LLM prompt-response mode of interaction with one based on continual real-world feedback, and designed the new incremental (Bayesian?) learning algorithm to replace SGD, maybe the next question is what model is being updated, and where does this happen? It's not at all clear that the idea of a single shared (between all users) model will work when you have millions of model instances all simultaneously doing different things and receiving different feedback on different timescales... Maybe the incremental learning now needs to be applied to a user-specific model instance (perhaps with some attempt to later share & re-distribute whatever it has learnt), even if that is still cloud based.

So... a lot of very fundamental changes need to be made, just to support self-learning and self-updates, and we haven't even discussed all the other equally obvious differences between LLMs and a full cognitive architecture that would be needed to support more human-like AGI.