It is not that simple. If britain/france were not involved in the war, the germans would still have to go through poland. Barbarossa came as a suprise because everybody believed that germany is going to attack england. With that out of the question, as it is in this "what if" scenario, russia would have been ready for war. Do not forget that SU had much more airplanes than germany (although not as advanced) and air superiority of the germans would be in question. German army achieved air superiority because it destroyed russian airplanes on the ground. That would not have happened if SU have been prepared.
Also, german tanks (panzer IV) proved ineffective against t-34. "Panther" came later, after they realised panzer IV ineffectiveness in russian campaign. But t-34 was more than a match even for a panther, and not to mention it was 4 times cheaper. Next improvement, the tiger tank, was to bulky and slow to carry out the offensive.
Therefore I think that the result of the campaogn would have been the same.
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