Tibet could never be a viable independent state and would either become a Chinese puppet or a launching pad for American and Indian power against China.  Given the realities of geography, Tibet has little prospect of real independence. Landlocked, with few natural resources, and no clear way to get any resources it does have out, Tibet would be poor, and overshadowed by its much larger neighbours, China and India.  It would be faced with the choice of either becoming a prize to be fought over between those two powers or aligning itself with one or the other, most likely India given its difficult recent history over the last few decades.  The consequence would be that rather than giving the Tibetans greater freedom, independence would render them pawns, and rather than reducing tensions in the region, it would likely increase those between India, Pakistan and China. Tibet would be in the same position it was at the end of the 19th Century when it was a weak power at the mercy of the British and Chinese having to toe the line for whichever neighbour was stronger at the time.  Its hard to see how the United States could avoid being drawn into such a geopolitical quagmire, with likely negative consequences for the Sino-American relationship as well. The US having played a key role in gaining freedom for Tibet could hardly stand aside if that freedom was threatened, and the Chinese in turn would view any US influence in a free Tibet as further evidence of the existence of an American hand behind the Tibetan Freedom Movement.