Very true. The choice of a language isn't just driven by how appealing it is to oneself, but also how appealing it is to the broader population of developers. If you use a language that no one wants to work with then you're going to have a tough time getting people to want to contribute. You also end up limited on the third-party libraries that are available if you pick a language that isn't popular.
So I for one find it interesting and it affects my sense of how it will play out.