IBM invented the first smartphone in 1992, and Microsoft unveiled the first smart watch in 2004. Both devices proved ahead of their times and were commercial failures due to their high costs and limited capabilities.
This gives me hope that other promising consumer technologies that disappeared will return and live up to their original promises. What comes to mind first is augmented reality glasses. Google Glass was released in 2013 to much hype, but proved a commercial failure. I tried a pair of them a few years ago and quickly understood why they didn't become popular: they were too expensive, the augmented vision only filled a small fraction of the wearer's field of view, and it was too hard to interface with the device to give it commands. But there's no reason to think all of these deficiencies can't be solved with time, and I predict augmented reality glasses will return someday and become popular, as happened with smartphones and smart watches.
See also: https://www.smartins...-10-years-away/