So jaguar, if losing those other cultures is such a shame, are you willing to give up your culture and adopt theirs? They left their culture because life sucked for them and they saw a better choice. You're assuming they were victims rather than people who made a choice, and an easy one at that.
So why don't you give up your computer and Internet, and electricity for that matter, and go dip candles by hand your whole life? Because that life is boring and tedious, and once they saw a better alternative they rushed to it. Sorry you lost the ability to sit in your living room and read about or watch these quaint, interesting cultures from your own creature comforts, but how else would you have it?
And how does juju's post not make sense? If you want to keep other cultures from being infected by our ideas, the only way to do that is to prevent them from having the knowledge that other cultures exist. Because let's face it, most humans when given the choice would choose the modern culture. That's why it exists: because freedom of ideas have produced it.
http://www.tobiasly.com/misc/onion/amishgiveup.html