[B1FF_PSUVM]

There are things such as electromigration that mean that solid-state stuff can wear out.

(Electrons are being pushed around by electric fields higher than 1 MV/m, and do smash into things ...)

I'm not complaining about my seven year old machines, but I'm not too sanguine about the current crop lasting as long ...

[timthorn]

Indeed - and smaller feature sizes increase that risk.

[kjs3]

Electromigration is a thing, but if you're applying your design rules correctly, it's one you worry about over decades, not months or years. I've had 30 year old ROMs/PROMs fail due to electromigration (presumedly, I didn't decap them and look), but never a CPU.