I don't think that's true. Despite their corporate life support and relatively young ages, Go, Rust and Swift are all in the top 25 most active languages on Github (https://gist.github.com/alysonla/e14c01ec7a0d2823e7317f7b58b...) and D is not (and never has been).
The masses have had a long time to adopt D and I wouldn't get my hopes up simply because it's not dead yet.