It might be the language he is looking for, but it might not, and more likely than not is not. D is one of those odd languages which most likely ought to have gotten a lot more popular than it did, but for one reason or another, never quite caught on. Perhaps one reason is because it lacks a sense of eccentricity and novelty that other languages in its weight class have. Or perhaps it's just too unfamiliar in all the wrong ways. Whatever the case may be, popularity is in fact one of the most useful metrics when ruling out a potential language for a new project. And if D does not meet GP's requirements in terms of longevity or commercial support, I would certainly not suggest GP adopt it too eagerly, simply because it happens to check off most or all their technological requirements.