Bingo. Which is why it's a quality not to have dependencies on any specific software when designing a format for longevity. XML has an absolute minimum of such dependencies, Open Document has only zip added to the mix, which is a format with tons of different and independent implementations, plenty of documentation for how to implement it - on top of being a fairly simple format to begin with.
SQLite for all it's significant qualities are none of that, and thus you shouldn't use it if designing for file format longevity.
At this point, you've side-tracked into an argument that anyone could make against any software.