The Chinese might not want to destroy Tibetan culture but unrestricted development and materialism would. China is bringing their own 'culture' minus the religion, ideas of development, and consumerism, imported from the West into the Tibetan region. Indirectly China is destroying Tibetan? Or indirectly the West is destroying China?
On a more subtle level you don't need to destroy something physically but you can 'win', 'take control' by destroying their psyche. Make others follow your own mindset. Isn't communism has this kind of thinking? My question would be is the Chinese destroying the psyche of Tibetans? So it goes back to human rights, and human speech issues? I don't know about Tibetan culture on freedom of expression but isn't China going to use the same policy on Tibet?
The Tibetan world is changing, every world is changing.
Change is the rule of the game.
Fast Food chains are changing the way people eat.
TV has changed the way people spend their free time, and thus has changed the social fabric of many cultures totally.
Lifts change the way we design buildings.
Air-conditioning changes the way we work.
Internet changes the way we communicate.
Mobile phones change the way we interact with each other.
Shopping centers and super-markets change the way we shop.
Advertising changes our desires.
Etcetera...
China is not a perfect country, no country is perfect.
China has policies, it has a language, it has a culture, it has a history, old and recent.
So is Tibet.
Now they are mixed geographically.
Going back is not an option.
Moving on, moving forward and continuing to improve is the only way.
China has shown respect for the Tibetan culture for many years now (it has not always done so, but it is doing so now), so there is room for two cultures to build something new, something beneficial for the next generations.
So I would not approach this situation with a mind of romanticism, but with a mind of positive action, with respect, with collaboration, for the well fare of this and next generations of Chinese and Tibetans in Tibet.
This is not a resigned, fatalistic nor submissive train of thoughts.
This is a peaceful, courageous, pro-dynamic and forward thinking train of thoughts, that encompasses the well fare of all people, of all cultures and of spirituality.