Robert Maxwell wrote:
Indeed, as was shown in the film itself, those who wanted to come back were welcomed with open arms.
We only saw a single Sona paying a visit to his mother.
But who knows, maybe after interacting with the Sona elderly, the youthful Baku will themselves push for the particles to be collected so that their very own offspring will benefit from them. Parents will make sacrifices for their children that they wouldn't make for strangers.
The Ba'ku have adapted their society over a few centuries to be accustomed to and comfortable with immortality.
Ahh, so the Baku are capable of adapting their culture and society. That means they could (just as easily) adapt again.