I would agree with you if Stalin had died in the spring of 1945, and had been succeeded by Khrushchev--then I think there would have been a real genuine possibility for a relaxation of tensions. But as long as Stalin remained in power (or if he had died and been succeeded by someone like Beria or Zhdanov) it seems to me that the inner dynamics of the Soviet system and its leaders' psychology were driving toward the internal outcomes we saw in the Soviet Union and Eastern Europe between 1945 and 1990.
After all, at various times during the 1920s and 1930s, Zinoviev, Kamenev, Radek, Bukharin, and Kirov had thought that peaceful coexistence with Stalin was attainable...
Brad DeLong