On the other hand, somebody has to write those libraries, and each "missing" library is an opportunity for a new project.

One thing I like about less popular languages is that it's often easier to get involved in the community, easier to contribute to projects, and more likely other people will use the libraries I create.

I like Python, but it often feels like I'm just plugging together pre-existing libraries for everything. Good for getting things done quickly, but less fun and less rewarding.