Maybe I am wrong but I get a feeling from posts in this thread
that some people are greatly underestimating the size of some
segments, like mentioning niche C++ programmers and only 0.01%
percent of developers needing memory management. The games
industry is growing like crazy [1][2] and after all these years
C++ is still the main language for that except that today 99% of
those developers have many bad things to say about it. Imagine
how D adoption would jump if someone created something on par
with Unity or Unreal engine, or even Cocos engine in D. And I
think D is already up to that task, with biggest pain points
being only cross platform support, especially for Android and iOS.
Also regarding the question whether D should be marketed as
general purpose or some special purpose language I find this
article [3] has it explained nicely, except that it seems to me
language should be marketed as general but have strong libraries
(or game engines) for specific purposes through which it should
market itself as something specialized.
[1]
http://kotaku.com/nearly-40-of-all-steam-games-were-released-in-2016-1789535450
[2]
http://www.gamasutra.com/view/news/267645/Over_500_games_now_submitted_to_iOS_App_Store_every_day.php
[3]
https://simpleprogrammer.com/2017/06/19/generalists-specialists/
