SU wouldn't have a chance? It is the early 1950s we're talking here I gather? In other words,
you're dreaming!
Now sure, the USA would be spared the destruction, but if WW3 came in 1950/51, what's going to stop the Soviet Armies from driving into Western Europe? W Germany is a mess still from WW2. France isn't any better than W Germany. The UK is better than W. Germany & France, but
not that much better. And the other European countries, such as Holland, Belgium, Italy, etc haven't got a chance in stopping the Soviets. Meanwhile, the US military is distracted in Korea &
not Europe.
Then there are the Chinese communists. Considering they had just kicked the arse of the UN forces, who were mostly American, back down the Peninsular, how on Earth are the Americans/UN going to stop several million Chinese doing whatever they want in the entire East-Asia region? Nuke them all? I think you'll find that the USA will run out of nukes long before the Chinese run out of troops! Go ask the Soviets about their joke in regards to a war with China...
But yes, America will be safe from most of the ravishes of WW3 in 1950, other than suffering a million or so casualities etc. Korea, however, will be a wasteland. Several Chinese cities will be hit with nukes, as will several Soviets ones. Meanwhile, Europe is all occupied, as is much of Asia - maybe even Japan.
I'd dare say that it's far better that such a war was never fought.