Full Question: What if the Vietnam War ended in a cease-fire and both North and South Vietnam’s were restored just like in the Korean War?

This is essentially what happened. Long term it didn't pan out because of Watergate and and the 1974 Midterms removed the political will to continue supporting South Vietnam. In the absence of American logistical and aerial support, the ARVN folded under the weight of a mechanized NVA push after roughly three additional years of conflict.
 
You would need firstly non-corrupt or at least more cabable SV government before you can keep that around.
 
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