Samsung unveils new PCIe 4.0 SSDs that "never die"

Time. SSDs, like all flash memory, require to be powered at least occasionally for the data to remain intact. If you don't do this, you'll lose the data over a period of a few years. This would make SSDs uninteresting for any kind of digital archive, although those usually use tape to store data anyway, as it can save the highest amount of data for the space it's taking up.

EDIT: Also, I don't know much about SSDs, but even if you move data off faulty NAND chips, the chip remains faulty still. I don't know if this is a software issue or a hardware one, but if it is the latter, the SSD will still fail after a set amount of writes, just do it more slowly as the space on it becomes gradually smaller.