Sooooo, Niji JP is thriving despite the opinions of those outside JP? I don't see parallels of the campaigns to leave Niji EN in JP, the issues you care about the JP audience does not. Neither do much of the JP Niji vtubers, including the top talents that would need to "die" to change their mind. The JP vtuber industry is more aligned with Niji then your ideals, assuming Hololive, so while I agree with you that it's fucked I continue to be confused why you state NijiJP is not thriving.
Tl;dr JP doesn't care about your EN feelings