Not sure how much this gels with me, Buddhism first arrived in Tibet during the 5th century and really spread during the 8th century whence it mixed with Bön, creating something beautiful. 

I don't think teachings, especially spiritual ones should be made culturally exclusive.  Maybe the real issue is an appropriate integration of teachings within the framework of specific culture?  IMO spiritual teachings transcend time and culture, I see them as inclusive, sadly 'we' have been great at projecting spiritual elitism.  I might be taking your paraphrasing out of context though and in no way do I profess that the Dalai Lama practices spiritual elitism...

Love