There is a distinction between "the technology would never be useful" and "we are in a bubble that will burst." See https://en.wikipedia.org/wiki/AI_winter http

There is a distinction between "the technology would never be useful" and "we are in a bubble that will burst." See https://en.wikipedia.org/wiki/AI_winter https://en.wikipedia.org/wiki/AI_winter for many examples of the latter with regard to various incarnations of "AI."