ORIGINAL: Pelton
Its really kinda funny when poeple argue economics or logistics when Germany was still in a peace time econemy in 1941.
Not funny, just simply the reality. In order for the Germans to do what you propose (send everything east, develop some magical additional logistics capability, etc) would mean that Hitler never gains power, and that likely means no war to begin with and no WitE game. The Nazi system was rotten and inefficient. That's why it failed. Goering in charge of production? He sat on his butt most of the time, entertaining guests at his mansions. All the in-fighting between various Nazi jurisdictions, the inability of industries to work together, the use of inefficient slave labour, etc. The Nazis were working on a shoestring budget (figuratively) the whole time and eventually it caught up with them.
And what are the western Allies doing with all these extra 2nd and 3rd rate German divisions (and aircraft) in Russia? I suppose they're enjoying a nice summer of tea and crumpets at the beach? A large amount of resources (food in particular) was stripped from occupied western Europe. With the west unoccupied, the Germans get little of this, the Resistance is fully operational and supplied, the Allies probably land in Europe in 1942, Italy likely surrenders in 1942, southern Europe is open to Allied occupation, etc.
It's all very easy to say with hindsight that Germany should or could have done this or that. People often forget about political, economic, social, and other constraints and pressures. These kinds of events and timelines don't happen inside some kind of easy to understand bubble. The likelihood of Germany pulling some magic bullet out of it's hat is just as likely as Stalin's purges NOT happening, and the Red Army being in much better shape in 1940-41 than it historically was.
As with many things in war, the invasion of Russia was always going to be a gamble with a good potential for failure. To simply brush it off and say if Germany had done a couple things differently that it would've been easy is to assume that Germany was existing in a vacuum and that those around Germany (people and societies) would simply stand around doing nothing differently either.
