And there are orders of magnitude more JS programmers. Not every package on DUB is a gem either. So I think overall it's a reasonable proxy for language popularity.

By other measures, like number of committers in open-source projects, it's also small and not growing:

https://www.openhub.net/languages/compare?language_name[]=dm...

GitHub trending struggles to find enough projects to show a full page:

https://github.com/trending/rust?since=weekly https://github.com/trending/d?since=weekly

And of course Golang dwarfs both in popularity. I'm not saying popular is good, but merely answering OP's question about language's growth.