Honestly, it's difficult to say where plateau is right now. We simply don't know what the impact will be because we're still actively developing and learning to apply this tech. I do agree we are currently in a bubble, but it's worth remembering that when internet started becoming popular there was a similar bubble, but the underlying tech did prove to be transformative.

All that said, I really don't think his predictions about AI are what's relevant. It's the acknowledgement that capitalism is not a productive way to harness automation that's his real insight here. It's valuable to see prominent people like Hinton say this loud and clear.