Could the US save South Korea if Korea wasn't a peninsula?

Mar 2012
New York City
Korea being a peninsula made it an easy place to defend against the communist attacks, the communist threat could be funneled or bottlenecked at the North. The only way to attack South Korea would be cross the 38th parallel, any attempt by sea would be too risky to actually work.

What if this advantage didn't exist?
Lets pretend in a hypothetical scenario that South Korea shared a large border with Maoist China, that this border allowed the communists to attack South Korea from its western border, this border also allowed the communist to bring constant amount of supplies, ammo and men into South Korea. Sort of like the ''Ho Chi Minh trails'' during the Vietnam war.

This scenario brings out three direct consequences.
The Inchon landing would not be possible.
The supply problem that broke the back of the North Korean offensive in the summer of 1950 would not be a problem anymore.
The communist guerrillas in South Korea would not be completely isolated from their communist allies anymore thus could carry the operations longer to bog down rok and us forces much longer.
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