This has been an interesting debate so far. But, if I may interject, the focus has been exclusively on a scenario where the CP win after a long, drawn-out conflict. What would German politics look like if the war had been shorter? What if the Marne broke in the Germany's favor? Would a shorter and less devastating war remove the conditions which facilitated the military's increased grip on the government or was that simply inevitable?
As I stated above, a rapid central power's victory gives Wilhelm and the Generals more capital to maintain the status quo and or wrangle some more money out of the SDP.
The SDP supported the war and voted war credits and bonds; in the euphoria of victory Wilhelm and the generals could propagandize for more cash; but they wouldn't get anywhere with saying SDP and trade unions where a societal problem or unpatriotic; and Wilhelm's pet right wing Nationalist parties would continue to not accomplish anything; even if elections where called right after victory it's unlikely you would see a noticeably different governing group sent to the Reichstag