It does not really matter if they relax their immigration laws
.If the mindsets of japanese are not welcoming to foreigners even
to overseas born nihonjins, it doesn't really make much difference
cause it will be the gaijins who will be dealing with the japanese
on the ground not the immigration officials.
I guess that people who flocked there will be mainly
opportunists who wanted to make some money and have little
attachment to Japan.This group of people will not be keen to put
down their roots there.How can one assimilate into a society that
rejects them?
I'm not saying that there are no gaijins who wanted to be
accepted as part of the tribe, but again it all depends on the
Japanese psyche towards foreigners
Very amusing. You have made a statement, and then
counter-argued against your own statement! 
You said this :
"Unfortunately Japan immigration are not gaijin friendly or else
more asians will move there instead to Australia."
And I questioned, based on WHAT do you make such a groundless
conclusion.
And then you went forth to say it doesn't matter, the Japanese
won't really make gaijins feel at home, and the gaijins won't
really sink their roots in Japan, yada-yada, which effectively
means that you have shot your own comment to smithereens
single-handedly! 
