I think Trumpy is about to give up Taiwan for US own sake since he doesn't want to drag US into a full scale war with China because of Taiwan. The likely hold that Trump US will intervene military if war break out over Taiwan strait is low unless he also wants US destruction. Taiwan matter is none of Americans business. China is not in a hurry to take over, but would do only in three scenarios as outlined in Chinese Anti-succession Law, Taiwan declares independence, a foreign power sends troops to station or occupy Taiwan, or Taiwan becomes chaotic and ungovernable. Otherwise, China has patient to wait. Any way, I don't think China is scared of US even since the Korean war, Mao actually fought both superpowers US and Soviet Union at the same time in the cold war, China also had a mini war with Soviet on the islands on Ussuri River between China and Russia.