And yet even if there are not cataclysmic events, and even if the data survives on the media, will there be supported devices to read that media anyway?
In 1986 a 20Megabyte hard-disk was considered big, 5.25 (360kb) inch floppy disk drives were common, and 3.5 inch floppy (720kb and 1.44Mb) drives on the horizon.
Jump to 2014. I'd fill that 20MB disk with a single frame from my 5D3 (RAW, of course!). Many laptops don't come with CD drives as standard, and floppy disk drives are a thing of the past. Where will you read your CDs and DVDs, BlueRays of today in 2024, let alone 2114. Will hard-disks be like last generation vinyl records?
The only obvious longevity plan is keep transferring the digital data to the latest technology to at least give it a fighting chance.
Maybe film and archival prints are best after all??
There are already problems with BluRay compatibility, although some of that may be from overzealous copy protection.
I have some music CD's I made back in the early 1990's, and they still play. Kinda surprised because those burnable CD's are dye based. They may yet fail. That said, the CD format has been on the way out for a while- at least for music.
Finding consumer grade VHS players and record players isn't difficult yet. I suspect that some form of optical drive will be available for a while. You can still get minidisc players.
100 years? I'd bet that there will be some sort of practical 3 dimensional atomic level crystal based storage long before 100 years comes around. No one knows what the next 10 years will bring.
The Singularity is supposed to happen by then (2045), optical drives will not be a problem.