I specifically said do not mention LTO because I knew it would happen. LTO-advocates fail to see how pointless LTO is for someone who is well-served by a backup/archival strategy that uses optical media.

When I say "I'm concerned about whether I could buy newly manufactured drives and media in 10,20 years", the answer cannot possibly be "LTO". Because in order for LTO to make any economical sense, I would have to buy ancient LTO drives, and ancient LTO media compatible with those drives, and ancient computers compatible with the interfaces used by those drives.

Therefore I already know the answer on whether I could possibly buy newly manufactured LTO drives and media in 10,20 years, and it starts with a NO. Even today I would be forced to buy second-hand drives. Why would I even entertain LTO as an option, then?

Compare this to BD where in at least today you can buy a simple and cheap USB drive and new media, all of them manufactured today, and not break the bank while doing so. And drives have evolved from $propietary->PATA->SATA->USB, keeping up with the times and interfaces. (Interestingly, I can also buy newly manufactured USB 3.5inch floppy drives. But not media.)

I mean, certainly LTO has its advantages, but in the same way that someone requiring to archive 8TB of data would likely screech if asked to do so with BD media, it just doesn't make sense to suggest LTO as a long-term alternative here.