It's a good paper overall, and I'm glad to see it's been published - especially the Maes-Garreau material! (I wonder what Kevin Kelly made of our results? His reaction would've been neat to mention.)
But reading it all in one place, I think one part seems pretty weak: the criticizing of the 'expert' predictions. It seems to me like there ought to be more rigorous forms of assessment, and I wonder about possible explanations for the clumping at 20+ years: the full median-estimate graph seems to show a consistent expert trend post-1970s to put AI at x-2050 (I can't read the dates because the graphs are so illegible, what the heck?) and also many recent predictions. Perhaps there really is a forming expert consensus and the clump is due to the topic gaining a great deal of attention recently, and then the non-expert predictions are just taking their cue from the experts (as one would hope!)
The link now points to the fixed proceedings (better image resolution). Sorry once again. Jan
The new paper by Stuart Armstrong (FHI) and Kaj Sotala (SI) has now been published (PDF) as part of the Beyond AI conference proceedings. Some of these results were previously discussed here. The original predictions data are available here.
Abstract: