Wozza said:
1. The cause of the change in the Barbarossa timetable is unclear
I was taught that the delay of the invasion was caused by Germany's distraction in the Balkans, trying to support Mussolini's position in Greece. Using this assumption, I had Germany be more concerned with the upcoming invasion and leave Italy to its fate.
2. The effect this has is also unclear.
In OTL, the German advance wasn't stopped until December, when winter and Soviet mobilization brought the German advance to a halt in the suburbs of Moscow. With another month of movement before winter set in, it seems possible to me that the Germans could have at least encircled Moscow before winter made further advance impossible. The rest of the timeline is based on the German capture of the Soviet capital.
3. It is arguable whether conquering the USSR is within German capabilities at all
Granted. However, without Moscow, the Soviet task would have been made much more difficult; with a little luck on the part of the Germans, conquest could have been possible.
4. It is arguable that the Soviets have enough strength to stop them even so.
The Soviets still had a lot of manpower left, it's true. However, that strength is useless if it can't get to the front. Moscow was a transportation hub; the Soviet war-making capacity would have been greatly harmed by its capture.
5. No clear reason is given for the Japanese to attack Vladivostok.
In OTL, the Japanese were planning to move in one of two directions: East against the US, or north against the USSR. With Germany in control of Moscow and the Soviets apparently knocked off-balance, the Japanese may have decided that they should glean what they can from the falling giant, rather than take on the sleeping giant of the USA. That the Japanese were going to attack somebody is not in doubt; in this case, they may have decided to stay on their side of the Pacific.
6. This TL is remarkably similar to that in the alternate history fiction book Hitler Has Won. A mediocre piece of literature, my main memory of which is the one armed German officer hero finding his girlfriend naked with another girl "and one of those objects one reads about in smutty books."
Never heard of it; my AH literature experience consists mostly of Turtledove and a few other authors.
7. Actually I quite like the Timeline but it is not thought through - you have not said why the Germans change their actions, other than your own hindsight. Nor have you thought through Anglo-American reactions to such a German victory, they will not sit around and wait for the end.
I'm not an expert on history; I'm only a kid with a passing interest. I'm sure there are others who could look at the thoughts and actions of the German leadership and determine why they made the decisions they did and how they could change. I, however, do not have the patience or resources for this. Instead, I will use a change in decisions and run with it, without worrying about the cause of that change.
I'll admit, I didn't think much about what the British would do. Save some miracle in Italy in the form of competent military leaders taking over in Greece, it seems that the Italians would have been driven out of the Balkans, causing the peninsula to become a base for the British, who may try to drive into Germany's belly through the southern Axis members. This course would also have caused the Italian effort in North Africa to collapse. Yugoslavia would likely have remained neutral, to serve as a shield against direct invasion of Germany; would Bulgaria and Romania have been able to hold back the British? I don't know; I also don't know if the Germans would have the strength to help them if necessary while continuing the war against Russia.
Britain may have decided to invade and occupy Italy. Historically, this caused Mussolini to be overthrown; with the Wehrmacht tied up in Russia, Germany may not have been able to take over as it did historically. Would this have been a great loss? Vichy France was still neutral, as was Switzerland; the only method Britain would have had to invade Germany would be through the Alps. Germany may have been capable of holding that route with a few divisions- after all, the Alps aren't very easy to invade through.
In this altered scenario, my timeline would have to be bumped ahead up to a year while Germany cleans up in Europe. However, I think the gist of the TL is still possible.