Except unpowered SD cards (and SSDs for that matter) don't claim to hold data for more than a couple of years.

I'm a big believer in thinking you have backups being worse than knowing you don't, so anything that encourages people to believe $(flash memory) is suitable as long-term cold storage is actually, really bad.

I agree there's no need to copy & wipe cards immediately, but treating them as "film" is inherently flawed and setting yourself up for failure. The amount of people that turn up in data recovery forums unable to access old, important, "backed up" (memory card/ssd on a shelf) photos is depressingly high.