Dooming moscow is not a gamebreaker in this edition
It opens the possibility of getting france back in the game, if the Allies can push past normandy
At 17 if it controls all but FIC, it is a power that is near Russia's IPC stockpile when it fell.
Basically losing Moscow is dooming the allies in this edition. If Moscow falls, Germany (or maybe Italy) gets all of the Russian income and there are no allies which can take back the Russian Capital. For the Axis to win they must take Moscow unless they are planing to invade U.S.A. for victory cities.
Once the Axis have consolidated and linked up it's good night for the Allies. It's been that way in every edition. It is that way now. Germany just has to neuter the U.K. fleet in the Atlantic. I think that a sub in the Balitic wil also help them fight the U.K. economically.
The lesson here is to not lose Moscow because if you do, Germany's Attention is now 100% on U.K.! Game over.