What makes people think that the future advances in AI will continue to be linear instead of falling of and plateau? Don't all breakthrough technologies develop quickly at the start and then fall of in improvements as all the 'easy' improvements have already been made? In my opinion AI and AGI is like the car and the flying car. People saw continous improvements in cars and thought this rate of progress would continue indefinitely. Leading to cars that have the ability to not only drive but fly as well.