> I feel like it's dying

I can't control how someone else feels, but I can tell you your feeling is very wrong. Just a few of the things people are being paid to work on right now:

Android support

Webassembly

Symmetry Autumn of Code projects

There will also be paid work on iOS once they find someone that can do the job (if they haven't already). And yet another annual DConf will be taking place in London in June.

These are just a few of the examples where folks are putting real money into the D ecosystem. The language continues to evolve (for example, moving to safe by default). This is by far the most active D has been in the seven years I've been using it.