No Chinese intervention in Korean War, does U.S. ignore Taiwan?

Saw this quote:

Taiwan exists because Mao decided to spend all his international capital on a Korean invasion rather than a Taiwan one, making the USA care about Taiwan again.

In an alternate dimension where Mao held back, we would have had a unified Korea and China, strange.

Is it feasible? Would Truman just let the ROC get conquered by amphibious invasion if Korea was left alone? And does that prevent the domino theory from ever being formulated? Mao defeating Chiang wouldn't be a different piece, it would just be an existing civil war wrapping up. The State Department and so on wouldn't be as alarmed by it as the prospect of the Reds attacking a separate country.
 
I wonder if Taiwan might be able to win against such an invasion. The Islands campaigns showed that they could win engagements where they had the advantage of terrain and intelligence. Red China made quick work of Hainan, so the goal would be waterline defense. But I think it is plausible.
 
From what I understand, Truman was sick of Chiang and ready to throw him under the bus but PRC intervention changed all of that.
 
I'm not so certain. The Navy was deployed to the Taiwan straits before Chinese intervention, an event which few predicted.
 
So assuming the ROK wins in the war and China slumps away to do its own thing. How does this affect Vietnam? Does the U.S. become less interventionist in Asia, even in the rest of the Cold War in general? Does the domino theory get wiped out?
 
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