It's not really about physical or ebook though. Both require a plan. The physical book requires a shelf and some climate control. The ebook needs to be DRM free

It's not really about physical or ebook though. Both require a plan. The physical book requires a shelf and some climate control. The ebook needs to be DRM free and stored on a 'digital shelf'. In a 100 years if we can't unzip a file and read text files, then we have likely lost many of the physical books also. Physical books also have a unique issue of storage space and hard to replicate.