George Patton originally proposed this idea as he imagined that the Soviets would become enemies with the United States soon after the war.
The Soviets didn't have a nuclear stockpile until 1950 and didn't have a competitive stockpile until the 1960's. We could have defeated Russia before they obtained nuclear weapons and before revolutionary China would get involved. The Allies could have prevented the entire cold war.
The U.S. was in a mountain of debt, an invasion on the USSR would have made repairing Europe less of priority, there were many communist spies in the US, and if the invasion turned out to be a failure, all hope for the world would have been lost.
Either way, it would have been a decision that would completely change history and it is something worth thinking about.