Unless I am dead I feel pretty confident that I want to see my photos and videos of my kids growing up in 50 years time (it would make me 90)!
The problem of "what to keep" isn't even digital-specific. In my youth I probably bought two dozen disposable cameras, had the pictures printed, even paid for the CD-ROMs when they became available. Where are those pictures now? Who knows! That's why I like Marie's message: it's not about throwing away junk, but keeping what you love close to you.