IMHO, with Molotov in charge purges might not have happened. All opposition had been destroyed and everybody else had been scared shitless by Stalin's purges. Molotov was a ruthless individual caught up in Stalin's paranoid mania, but he wasn't a paranoid fuck himself AFAIK. We wouldn't see the Khrushchev Thaw nor the Secret Speech under him, leaving Stalin's personality cult undisputed and repression and censorship in place, except without purges of Stalinist proportions. With a continued focus on heavy industry, the relative prosperity reached under Khrushchev wouldn't have been achieved. As far as foreign policy goes, probably no Sino-Soviet Split.