Gary Marcus predicted that deep learning was "hitting a wall" [1]... right before ChatGPT came out. At this point he's so committed to the bit that he has to keep predicting that this time, really, it'll stall, and hoping eventually a stall comes.
1: https://nautil.us/deep-learning-is-hitting-a-wall-238440/ Also note he doubts that scaling will work past GPT-3... Not uh, 20/20 foresight exactly.