I was only a kid starting my university degree at that time, but I had been coding since I was 9 and I was very excited about D. What I remember is that getting it up and running was a cumbersome, fully manual process. The compiler was closed-source, delivered as a tarball without any kind of installation script, ditto for the libraries. I wrote some little programs and I liked the language, but in the end I gave up.
On the other hand, Rust has rustup and Cargo which are just amazing. I am sure that a big part of Rust's popularity comes from Cargo.