On the contrary, this situation almost ensures that the Tibetans will become a puppet of one or another foreign power. Weak states almost invariably need allies to maintain their independence. An independent Tibet, especially one that has inherited the history of the last sixty years would likely be dominated by politicians who are militantly anti-Chinese, but would be too weak to defend itself against China. It would almost certainly become an Indian proxy, as its only hope of survival would be to attempt to gain the support of the United States and India against China.  In effect the creation of an independent Tibet, rather than avoiding conflict, would make it more pressing by moving the effective frontline hundreds of miles northward. Right now China and India may not like each other, but the Tibetan-Indian border is sufficiently mountainous as to make military action difficult if not impossible. By contrast, its northern border is much more easily crossed as the Chinese themselves showed in 1950. An independent Tibet would be a security threat to China and the region.