This paper (by a colleague) is being misunderstood - it is not a prediction about whether the METR exponential curve is ending, but an argument that it is plausible to model the exponential as a series of stacked s-curves, which would require further breakthroughs (at the scale of reasoning) to continue. I don't necessarily even think this contradicts what most insiders in AI, from Demis to Andrej, are saying!