Let's talk from a sociologists' viewpoint:

In the timeline of civilizations; cultures emerge, evolve and die out. This is natural. Where you happened to be in that timeline and in what culture is SOOOO unimportant. Languages come and go, foods, rituals,..you name it. 
And I agree; not everything we leave behind are bad, nor are good everything we embrace. This is just the demand of time. I love Nepal and am proud to be a Nepali, but clinging to the last drop is very stubborn. Some people who just enjoy their old culture will continue it bit longer, others will create/adapt  to a new one.
And why that kind of inferiority complex that 'we are losing to them'???? I see the foreigners also adapting to our culture, think Yoga. The world is being streamlined, brother.

I visualize cultures as a (pretty) girl's braid, each hair string grouped together, intertwined further, and creating a systematic and pleasant look.  In that process, some short hair strings don't make it to the end, SO??? Why is that a problem?