Krugman is loud-mouth idiot. Having said that, I think he's correct that the tech revolution still has a lot of gains to make. I think he's dead wrong that it will kill poor people unless the government steps in.
In the 1980's, I was told I was stupid to major in computer science because CASE tools were going to replace programmers. In the 1990's Indian programmers were going to replace American programmers. And manufacturing jobs were supposed to disappear by in the 1970's (replaced by robots). Liberal control freaks will use any excuse to claim that there will be armageddon unless the government takes control. Yeah, some jobs have been eliminated by automation, but overall that has grown the economy and the job market. So I don't see any reason why it's been essentially wrong for 30+ years, but suddenly it's right now because Nobel Laureate Paul Krugman (tm) said it.