Now, I'm not saying a timeline with no Hitler is definitely going to result in Communist Germany and the Soviet Union taking over the world or whatever. This is just one possible scenario. It depends on way too many factors to predict. For all we know, some other Hitler analogue would've come and rose the Nazi party to the mainstream.
You really shouldn't have bothered with everything up to then (and why/how would a 100,000 strong professional army led by Junkers be overthown by a group you admit were nothing but street fighters?)
Anyway, even if Hitler and the NSDAP had never come into being the hard Right had the ability to mobilise just as many street fighters as the communists.
And the freikorps would fight on behalf of the Reichswehr and the police if the government forces looked at risk of losing (they'd done it before).