The question is, will Xi bet big on bold moves that could result in potentially disastrous consequences?
Hong Kong offers a delicate initial test. Since passing from British to Chinese rule in 1997, the financial hub has operated as a "special administrative region," retaining its own legal and economic system and enjoying a considerable degree of autonomy from Beijing.
That arrangement was supposed to last 50 years, until 2047, but calls for political reform in the city and what many see as Beijing tightening its controls and encroaching on freedoms there have created rising tensions.
"Using the high degree of autonomy to reject, fight and erode the central government's comprehensive jurisdiction is absolutely not allowed," Zhao Leji told members of the National People's Congress, which passed a constitutional amendment Sunday abolishing presidential term limits, opening the door for Xi to rule for as long as he wants.
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Hong Kong activists had already been set on edge by the disqualification of pro-democracy lawmakers from the city's Legislative Council and the apparent abduction by Chinese security forces of several men who published salacious tomes about China's leadership.
"I don't think bold action is necessary with respect to Hong Kong," said Michael Mazza of the American Enterprise Institute think tank in Washington, D.C.
Xi is "already well along in the process of turning (Hong Kong) into just another Chinese city," he said.
Self-governing Taiwan, however, is quite a different story, posing a direct challenge to the Communist Party's claim as the representative of all Chinese and guardian of Chinese sovereignty, independence and territorial integrity.
By casting himself as a leader of historic standing, Xi has assumed the mantle of unifier and may regard failure in this regard as a stain on his reputation.
In his most direct comments on the issue, he told a Taiwanese envoy in 2013 that a final resolution was required, and that what he regards as the "sacred mission" of unification "cannot be passed on from generation to generation."
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