A lot of the industries in European Russia were relocate to the east but, several large production plants were left in the Moscow ,Leningrad and Stalingrad areas. What the Russians would have lost if the Germans had occupied up to the Urals is manpower as the lands west of the Urals contained most of the Russian pop. So the Soviets would be hard pressed to fight a war of attrition . Plus most of their farm land is in the western part of .