At least half of those the promise was realised though - mobile is substantially bigger than the market for computers and cloud turned out to be pretty amazing. AWS is not necessarily cost effective but it is everywhere and turned out to be a massive deal.
Big Data and AI are largely overlapping, so that is still to play. Only web3 hasn't had a big win - assuming web3 means a serious online use case for crypto.
"Die down" in this context means that the hype will come, go and then turn out to be mostly correct 10 years later. That was largely what happened in the first internet boom - everyone could see where it was going, the first wave of enthusiasm was just early. I don't think any technology exists right now that will take my job, but I doubt that job will exist in 20 years because it looks like AI will be doing it. There are a lot of hardware generations still to land.
I dunno, I think there might be different sets of "promises" here.
For example, "cloud infrastructure" is now a real thing which is useful to some people, so one could claim that "the promise of cloud infrastructure" was fulfilled.
However that's not really the same promises as when consultants preached that a company needed to be Ready For The Cloud, or when marketing was in a slapping "Cloud" onto existing product marketing, or unnecessary/failed attempts to rewrite core business logic into AWS lambda functions, etc.
https://archive.ph/h6QW7#selection-2069.305-2077.1
https://www.bloomberg.com/opinion/articles/2024-06-20/google...
At a point in time the database was a bleeding edge technology.
Ingres (Postgres)... (the ofspring of Stonebreaker), Oracle, ... Db2? MSSQL? (Heavily used but not common)... So many failed DB's along the way, people keep trying to make "new ones" and they seem to fade off.
When was the last time you heard someone starting a new project with Mongo, or Hadoop? Postgres and Maria are the go to for a reason.
https://www.youtube.com/watch?v=b2F-DItXtZs
It's all just history repeating.
Postgres adopted a lot of mongos features when it released the JSON data type and support for path expressions
But that's all it is, hype. It'll die down like web3, Big Data, cloud, mobile, etc. It'll probably help out some tooling but it's not taking our jobs for decades (it will inevitably cost some jobs from executives who don't know better and ignore their talent, though. The truly sad part).