I'm not sure inertia is correct for this. I think the reason is there are no needs for non-english charactered programming languages. Let's think about there are perfect program language made with Korean. If you are programmer, then you already know program languages made with English even if you are not a native speaker. Now you have to learn "New" program languages. You are native Korean so maybe have some advantage but it is still new thing. If you are not programmer yet. You have to learn program language, in this case most users are already using traditional program languages so you can't skip Python or C or Java.