The idea that if something is done quickly enough then the West will accept it, didn't work for the Argentinians. The Brits were quite happy to let the Junta butcher as many of their own people as they wanted to and still sell them arms, but put twenty thousand conscripts of a sheep infested rock in the South Atlantic and the Task Force sailed.
Taiwan is far more important to the US than the Falklands were to the UK so I seriously doubt if the Chinese seriously think that if they can take Taiwan whilst the Americans are napping that the US will go, "Ah well, nothing we can do now.." and wander away.
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