Why is everyone so concerned about people not using RDBMSs? Database management systems are not magic, they are just a query parser on top of some smart data structures. They are a generic solution, and might not be suitable for every situation, and that's why people are examining other data storage and retrieval methods.

It's kind of odd, but I've noticed that databases are a touchier subject than most things in the computer world. If someone says they're not using a RDBMS, there is always someone who immediately jumps down their throat as though SQL is God's Gift To The World.

Anyway, RDBMS aren't going to go away, so if you like them, use them. Some of us are willing to experiment with other solutions, however :)