China's best weapon is its amorality. Because it is an amoral society and has an amoral government, it is free to pursue its selfish interests without moral restraint. This is now and has been in the past (see Vietnam war and the Korean war) its best weapon against moral societies such as the United States.
To the contrary, China has justice on its side. God has decided China shall become the world's superpower.
China fights Imperialists
A few important things to remember:
1. The Indo-China dispute over South Tibet is about a small sliver of land. The British Imperialists unilaterally declared dominion over South Tibet, despite the fact that South Tibet is populated by Chinese Tibetans and not Indians.
India is the successor to the British Imperialists and insists on the McMahon Line as the border boundary. China has always stated that this is unacceptable. South Tibet has always been populated by Chinese Tibetans and they are part of China.
Hence, you have Indian imperialists disagreeing with Chinese insistence that Chinese Tibetans residing for untold millennia in South Tibet are Chinese. The only eventual solution is a border war. Pushing back Indian/British imperialism is not easy.
2. China has been busy reversing Western Imperialism.
In regaining Hong Kong in 1997, China put an end to British imperialism and colonization of China.
In regaining Macau in 1999, China put an end to Portuguese imperialism and colonization of China.
Taiwan was separated from China in 1895 by Japanese Imperialists. Today, Taiwan is separated from China by the influence and power of U.S. Imperialists. There is no historical basis for U.S. intervention and insistence that Chinese people cannot settle their own civil war and reunite.
It's like China telling Abraham Lincoln that the Union cannot reunite with the Confederacy. It is just bizarre. For as long as possible, using its military power, the United States will not permit Taiwan to reunite with China. A divided China is clearly weaker than a reunited mainland China and Taiwan.
However, given current trends, relative American economic and military power are fading. 2049 is a reasonable date to expect China to push the American imperialists out of the Taiwan Strait.
3. By 2055, China will turn its attention to the Indian imperialists colonizing and controlling South Tibet. Brahmos or no Brahmos, China will bring a fleet of hundreds of J-20 Mighty Dragon stealth fighters and whatever other new Chinese weapons that become available to liberate South Tibet from Indian imperialism and colonization.
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In conclusion, China has spent the last few decades kicking out the imperialists. In the 1970s, China helped Vietnam kick out the French Imperialists (e.g. practically all of the anti-aircraft guns in Vietnam were made in China). In the 1990s, China kicked out the British and the Portuguese.
Admittedly, the United States is a hyperpower. However, over time, even a hyperpower is no match for Chinese determination. China will kick the U.S. neo-con imperialists out of the Taiwan Strait by 2049 and Taiwan will return to the motherland.
By 2055, China will focus its attention on the Indian imperialists. Whether they like it or not, India will succumb and Chinese Tibetans will be reunited with their kinfolk in Tibet and all of China.
In the meantime, it goes without saying that China will not permit anyone to steal Chinese thousand-year-old territory in the South China Sea.
By 2055, China would have fully reversed two centuries of Western Imperialism and colonization. We can all live in peace in perpetuity.