There are two aspects not discussed so far. The first is labor. I'm cool with "mysql as my filesystem" but most people have no DBA-foo and will be horribly lo

There are two aspects not discussed so far. The first is labor. I'm cool with "mysql as my filesystem" but most people have no DBA-foo and will be horribly lost. Who gets paid more, a "filesystem-oriented administrator" aka generic sysadmin or a "database-oriented administrator" aka DBA? Its going to be much harder to use, not easier. The second is "trends and fads" in persistent data. The calls for nosql as the universal cure for all ills have quieted a little. Fundamentally 99.9% of the time I just want something to quickly persist a binary blob, say a video file of a movie. I don't want to reimplement git in my filesystem because if I did I'd use git, I don't want a DB as my filesystem because if I did I'd use a DB. Ditto spreadsheets or VRML (remember that?) files. So the "nosql" analogy of a database driven filesystem is all the cool kids would "upgrade" to ext3 for performance reasons anyway and then come on HN to lecture everyone about how ext3 is the only way to solve all storage problems instead of the old fashioned and obsolete database-filesystem being proposed.