When he died there was no way of transcribing them automatically (there still isn't really). The boxes stood in my mothers already cramped attic for 13 years, then she got cancer, and she felt a need to finish up things, so she got a scanner and started just scanning.
When my mother died she had scanned about a thousand pages, not transcribed, not anything.
The text in the diaries were fun at times, sometimes depressing, seeing how little he cared about my mother and his family was crushing.
My brother wanted to continue the scanning but I told him that I wanted to throw the diaries away. He kept half a year of writing around his birth (there's at least a sentence) and my uncle did the same, then we just watched it all burn (not literally, we threw it away at the recycling centre).
Not everything needs to be preserved. I'm happy some parts is preserved. I'm happy that those diaries are ash.