Unlikely. The Soviets would most likely have taken direct action against the Nazis once they had seized Europe. Not only would they be a massive military threat but they would likely forge a universal Europa market and control inflation and prices for imports and exports. The Nazis would have access to every valuable export imaginable and other countries outside of Europe would suffer.
The Soviets discussed fighting the Nazis several times during the 30s and 40s and relations between the two nations were strained even after signing the non-aggression pact. Fascism was the enemy of communism and communism was the enemy of fascism. The two would be destined to fight even if Hitler hadn't invaded.
America would likely intervene in WWII even if Pearl Harbour hadn't been attacked. Only days before the 'Australian Pearl Harbour' occured during the Bombing of Darwin, where a US Frigate was sunk and hundreds of Australian civilians and servicemen were killed. The Japanese had successfully invaded Singapore and was ready to island-hop their way across the pacific to invade and destroy Australia. From the Pacific Islands, the Japanese could be supplied from a dominated Australia and had a base from which to attack America. The attack on Pearl Harbour was a pre-emptive strike by Japanese high command because they felt America posed a great threat and that their intervention was inevitable, especially after the campaign in the pacific against the Australians and the East Indie Dutch. Attacking the Australians ignited condemnation from the US and tensions reached a breaking point.
As to whether Germany would have won the war, it's unlikely. There are many factors that come into play. The Invasion of France and Poland were ideas that were met with extreme resistance from the German military and almost universal condemnation. The French Army alone was larger than the German Heer by over 400,000 soldiers and the French possessed the impenetrable Maignot Line. The Polish Army too, was almost as large as the German Heer. German commanders were apprehensive of an invasion of both countries as they feared this would lead to complete annihilation of the German Army, in both cases. It was through luck and some clever strategy on behalf of some of the German officers that victory was achieved. Blitzkrieg tactics played a major role in early successes during the war but could never be maintained during periods of total war due to the high coordination between all services and the consistent supplies needed.