In the mid '90s I envisioned good large glass flat panel computer with pen input, i.e. like a iPad Pro.
Pen computers already existed but were crude.
1999: A research group I visited had a mock-up of augmented reality "picture frame" with back camera. Again, we had to wait until the iPad before that happened for real.
Back in the '90s, after the rise of networked multiplayer video games I also thought that virtual reality would become popular. I stopped doing research in it in '00 and kept my ideas to myself because I understood that too rich immersion could be harmful.
The headsets are back now, but what I see is mostly single-player, thankfully. Someone else will eventually get the same ideas as I have, but at least it hasn't happened in twenty years.
TV-show QI's "General Ignorance" segment. My name for the show was "Buzzword".
I thought that in the future, we would wear our voice assistants in pendants hanging from around our necks. This seemed much more plausible than stationary speakers or bricks of glass that people are addicted to.