Google Base might turn out to be the most massive database ever created containing structured data.
If Google Base allowed users to store their structured data there privately and access such data securely then maybe in the future no one will need to keep his own database any more, one can just use the massive Google Base to store his application's structured data! What a thought.
Before getting too excited though about this idea, I don't see any reason why Google might be interested in offering such ability to store their structured data privately in Google Base. However, if Google finds out a way to make this option available to users, then this will change the whole landscape of databases and applications that use databases extensively.