Well, OK, I have an old Mac SE/30 at home. It's a fine machine for basic word processing etc. I'm running Word 5.1 on it, how old is that? Yet despite it being closed source, Microsoft, utterly unsupported, yadda yadda, it works fine. In 20 years, will I be able to have my own completely independent Google Docs running on a Unix that doesn't exist yet, in a datacentre operated by a company that doesn't exist yet, and have all my old docs still there?

Basically, I don't think this has been very thought through.