You also have to consider the fact that China has a
huge interest in N. Korea "disarming" its nukes. At this moment, there is still diplomatic relations between N. Korea and the US. Why? It might have something to do with Iraq. Last June, in the middle of Desert Storm II (Operation: Iraqi Freedom), N. Korea invited the US to sit down, but China insisted they also attend. China was invited, but only as an "interested" party, or intermidiary. I believe that once the N. Korean dicator dies, they Koreans (not N. or S., but wholey) will want to reunite and enter a more "stable" governmental form.
China may want Tiawan back, but they don't want to risk a fight with the US and everyone else. They have far fewer and far weaker allies than the US has. The US
will be able to get the French, Germans, Russians, and Canadians involved with them in a military operation if China even sets one foot on Tiawan.
China's dictator is insane, not stupid (not as insane as other dictators, though
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).