Obviously no one's seen it happen first hand. It's a projection based on what's known about the materials and how they're made. Burned CD-R's have definitely been out in the real world for people to learn how short their lifespans can be, though.

Nobody could "prove," for instance, that the Voyager 1 could stay operational in deep space for 47+ years when it was launched in 1977, but the engineers could still predict and they launched it anyway, and it did. I don't think your argument really holds water.

That's what I think when I read endurance/mtbf of hard/solid state drives of like 100+ years. Bitch you released this last week and I know for a fact that you didn't withhold sales for 100 years for validation of your claims. Also funny how I should reasonably expect 100 years out of it, but you will only provide a warranty for the first three...