"I expect some readers to think that the post sounds wild and crazy but that doesn’t mean its content couldn’t be true. If you had told someone in 1990 or 2000 that there would be more smartphones and computers than humans in 2020, that probably would have sounded wild to them. The same could be true for AIs, i.e. that in 2050 there are more human-level AIs than humans. The fact that this sounds as ridiculous as ubiquitous smartphones sounded to the 1990/2000 person, might just mean that we are bad at predicting exponential growth and disruptive technology."

https://www.lesswrong.com/posts/qRtD4WqKRYEtT5pi3/the-next-decades-might-be-wild