For...40 years? Demand for older consumer CPUs has dropped to zero over a few years because the new ones are demonstrably more capable and basically the same price. That's the whole idea behind Moore's Law. There are niche applications where that hasn't been true that were mostly filled by recycled hardware or single board computers. But in general people want the more capable device.
There's a whole conversation to be had about software bloat that that chain enabled but planned obsolescence it ain't.