I don't really understand this argument. Other cultures have survived contact with technologically superior civilizations. Examples are listed in your own post:

I don't really understand this argument. Other cultures have survived contact with technologically superior civilizations. Examples are listed in your own post: Africa, Japan, etc. People can negotiate how much an outside culture influences them. Even in cases where campaigns are made to stamp out culture (e.g. W. Africa, wherein anyone in schooling was given Western names and forbidden to speak their native language in school), the old mores still prevail if people where were willing to fight for it. And how can you measure that the parts of the culture that are lost, are more important than the practical benefit of say.... modern medicine dropping the early childhood mortality rate by 90%?