Signatures aren't as urgent to replace as encryption keys are. You can wait until someone is about to build a quantum computer, then change all your signatures. Encrypted data is more critical because the NSA's going to store all internet traffic for centuries if it thinks it can decrypt it later.
In terms of actually doing it, it's still very remote, but not as remote as it would have to be for us to completely ignore it. And the NSA has massive data centers full of hard drives storing our encrypted internet traffic.
Gradually, and especially when hot. Modern chips are pretty close to the physical limits of how small they can be made, and that means atomic/chemical effects like electromigration are accounted for and determine the lifetime. Every extra 10 degrees Celsius of temperature doubles the speed of chemical reactions.
When they stray too close to the line ... you get Intel's 13/14th gen chips that wear out after 1-2 years instead of 10-20 years. Intel calls it "Vmin drift" because that doesn't sound scary, but the actual point is that various wear-out mechanisms push the chip outside of its design envelope - increasing the voltage or lowering the clock speed may get it to run for a while longer, but you're living on borrowed time as the various circuits just stop working right and you get unpredictable instruction mis-execution: https://fgiesen.wordpress.com/2025/05/21/oodle-2-9-14-and-in...
Do casual computer users use the word "malware"? I think people only know the term "virus" but when I say "windows is a computer virus" everyone thinks I'm insane.
I think it's a case of projection. Megatech CEOs feel that avoiding interactions with peons is the most important thing, so they add this feature assuming that everyone else also wants that.