It was surprising Germany lasted as long as it did. Say Germany did a bit better and and knocked Russia out early... anywhere between 1916 and 1918. I think the returning troops from Russia may be of use to any sort of revolution. After all, many of them come from poor families.
But the morale boost from Russia winning the war probably gave some time to Tzar Nicolas II to abdicate his thrown for his son, Alexei Nikolaevich, Tsarevich of Russia, who was only 18 when he took the thrown in 1922. If it wasn't for his (his adviser's) reforms, there may have very well been a serious threat to the stability of Russia.
His father was also exonerated from the large deaths he saw under him when his son resided over the Treaty of Versailles, and then again over the Treaty of St. Petersburg (which as we know partitioned the Ottoman Empire). With Russia's old and most threatening rivals being knocked out of the world stage for good, the people of Russia were able to accept the time required for the political and economic reformation of their country.
OOC: How was that. It was my first DB I think.