That said: Nim does look nice.
Take javascript, for instance. If you're used to a C style based language with some functional patterns, jumping into a codebase and understand it is quite easy. But around the language itself you also need to know stuff like npm, webpack or similar, how the browser works, http concepts etc etc.
Or python, need to deal with pip, virtualenvs, perhaps poetry, need to understand the limitations to concurrency because of the GIL and how it affects deployments, perhaps django or some other framework, etc.
* dependency management and releases
* deploying and running in prod
* footguns that affect performance or security
* libraries for helping development
* language-specific features
etc
What's more interesting and what's more difficult to find shortcuts for is understanding the spirit of the language, knowing its weaknesses, bottlenecks and inner workings. The threading model, what's done at compile time and what's done at run time, etc etc. There are so many things you need to learn before you can judge any given language relative to others that you know.
Ecosystem > language awesomeness
Provided that one ecosystem is huge (e.g. Python) and the other one small.
With that said, learning to write production code in a small language allows for certain better developments in mindset (e.g. Stack Overflow? Forget about it) and better in the quirks of the language, which you will see (to a lesser extent) in other languages.
Unless there is a complete rewrite of the borrowing rules and thus breaking changes that's highly unlikely of ever happening. Instead of following what the industry promotes, the same industry that lays off thousands of people on a whim, maybe start following community projects. Do what you like most, don't expect them to change to fit your needs and wants and stop trying to get into every trend that is hot. At least that my mantra to prevent having regrets later on. Good programmers have a future no matter what language they use.
By your logic no community-driven project would ever be successful.