Doesn't seem they're really aware that they're something of an endangered "species". Although technically they'd still be endangered even if they open up seriously, as then there's heightened possibility of bloodline dilution. I wonder sometimes if that'd be a good or bad thing in the long run: loss of that which makes them pretty unique vs blending more with the world.
“Bloodline dilution” is only a thing if you believe your race is superior.
It seems they are very well aware. They've probably seen what happens to other "endangered species" (eg. the English or Swedes) when the floodgates are opened by treasonous bureaucrats chasing votes, economic metrics, or appeasing their destructive oikophobia.
> heightened possibility of bloodline dilution
In my experience, born/raised in Japan, domestic Japanese people have a very different reaction to local "Hafu" people where one of their parents is a Caucasian person from the US, UK, AU, NZ (or similar), vs "other" countries.
https://en.wikipedia.org/wiki/H%C4%81fu