Or take Rust, which has gained adoption more recently. It took a while to get going after the 1.0 release in 2015. If you look at daily downloads of Rust crates (https://lib.rs/stats) as a proxy for adoption:
- 2015 to 2017 - not many downloads
- 2018 - first signs of real growth, reaches 1M per day.
- 2018 to 2021 - 10x growth, 10M per day
- 2021 to 2024 - 10x growth (projected)
So new languages shouldn't lose hope if they don't see adoption immediately. It's possible that they might be adopted later. But for language authors, it's the hope that kills you. You continue working on it even if maybe you shouldn't.
I also am pretty sure I read about someone here on HN who used Crystal to build the code for their profitable cookie baking/selling business (the baked goods). I can't recall the details exactly. Edit: Here it is: https://news.ycombinator.com/item?id=23433847