The USSR probably would be stronger as the Sino-Soviet split is delayed, and when it does happen it isn't that bad. People talk about Stalin's brutality and totalitarianism, but this is the norm in Russian history, it didn't harm the Tzars, and it didn't really harm Stalin. People compare Stalin to western leaders, when he should be compared to Peter the Great and Ivan the terrible. If you look at Stalin's geopolitical accomplishments he could be argued to be one of the most successful Tzars to ever rule, and his sucessors some of the worst. Ten more years of Stalin would mean that Communism is more normalized in Eastern Europe, and Stalin would have time to pick a successor in his image, someone who wouldn't liberalize(and destabilize) the Soviet system. The USSR could very will survive to the modern day, sure the economy would inevitable stagnate in the 70s, but so would the westerner economies in the 2000s, all the USSR had to do was last until then and then they were golden, and they probably would have done it.
