Earlier quoted context omitted.
Then, D will compete with GC languages that outclass it in ecosystem diversity and metaprogramming.(i.e. it will remain same niche language it was for decades). Having a huge runtime with GC doesn't seem appealing or efficient.
Fret not, Python just a fringe programming language for more than two decades, it only then become popular. If you have the right fundamentals success will eventually come your way.
D is a native strongly typed language
You don't make game engines in Python, and certainty not drivers, python devs fall back to C when they need performance, this should give you a hint