The USB 3 standard is being finalized, that should last quite a few years! I mean USB 2 must be almost 9 years old, and it will still last for another few years. USB 3 will be backwards compatible. The other option is to use a high quality archive level DVD/Blu-Ray. Verbatim makes a disc that's certified for Archive purposes, but its pricey.
The netbook idea is nice, but I wonder if it will last, unless the time capsule is air sealed. Another thing to think about, is filesystems, if you use a Data DVD or flash disk, what's the chances the file system will be supported in 17 years?
Rather get a Good quality Portable DVD player, or something like it, remove the battery. Make a few videos, record it onto the Archival DVD, and store it in a air-sealed container, make sure no moisture or insects can get the the container, metal containers are a good option.