if you mean "hiring d programmers", i think it's somewhat of a nonissue. afaik d isn't particularly esoteric, so any new hire should be able to get up to speed quickly.
I'm not so sure about that. For the basics that's definitely true, and no doubt if you're a C++ programmer then it will be an easier transition, but if you're coming from a higher level language like Java, C#, PHP etc then there's a lot to get your head around. That said, it's absolutely worth it :-)
I come from a Perl/Js background and find D quite easy to pick up and be productive in, as opposed to C, C++ or Rust. With Rust and C I always find myself fighting the compiler.