>A related thought is that we probably will never reach the level of durability and redundancy of CDs and DVDs again ever.

This might be true for mass media, strong maybe, but it’s absolutely not true in general. You could use a laser cutter to cut holes in a glass or gold plate or something, if you extrapolate that to the far future you could imagine it would be something the average person could achieve in their home much like 3d printing is easily accessible now. Dvds after all are not that robust, they have long term issues.