Ah, just looking at this. When I was looking at D back around 2005 it was a closed shop run by one guy - I had the feeling it did not take off because it simply wasn't an open enough project.

It is a shame, as since then we've had go, Swift, Rust all come along and it is a lot more competitive for mindshare in that space... not to forget the merits of modern C++ (it is a far better language post 2011)