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Amara's Law still holds, though - technology is overestimated in the short run and underestimated in the long run.

I don't think Tensorflow et al have been busts, or have even fallen short of what experts expected from them. They were just never consistent with the slavering hype they got from university press offices, tech journalists, and startup hucksters.

I'm less convinced that blockchains will have a major long-run impact, but I expect solving the double-spend problem will prove useful one way or another.

Don't forget Big Data and Data Science. Sometime in 2017 cryptocurrency really blew up in popularity, and suddenly everyone in my LinkedIn network went from being a Data Scientist to Cryptocurrency Expert or Blockchain Developer. People love bandwagons.

People are still hyped about Deep Learning, I think.