I think the ultimate goal of the Chinese government is to convert Tibet into Chinatown and make Tibetans into Chinese. They see Buddhism and Tibetan culture as the foundation of Tibetan identity, and hence they physically destroyed 98% of the monasteries and nunneries in the 1960s, and 99% of monks and nuns were sent to prison.
They thought they could just physically change the foundation of Tibetan civilization, our culture and identity. That's their primary objective, but they have failed because spirituality has more to do with your heart and mind. The physical destruction in itself will not end the Tibetan identity. That's their main goal, hence the kidnapping or the disappearance of the Panchen Lama for almost 20 years now. It's a matter of grave concern. They want to destroy the foundation of Tibetan civilization and spirituality.