There are two reasons to replace a computer. One is an artificially amplified desire for something exciting, new and shiny. The other is the failure of software to run in under 8Gb of RAM. We call this replacement an 'upgrade', when what's really happening is a celebration of sustainability failure.
Related, a Hacker News thread from 2017: Almost everything on computers is perceptually slower than it was in 1983.
I think it's obvious that information technology can't keep going on this path. Not only is the subjective experience of the internet getting worse, it keeps getting worse faster. But I can't see any smooth way to get off the treadmill. My best guess is, the failure of technology to serve human needs, will lead to breakdowns in mental health, which will cause societal breakdowns, which will cause more frequent failures in the infrastructure necessary for a high-tech society.
Or it could be much more sudden, if we get a Giant Solar Flare.