If there is no Hitler and no Nazi Party, the German economy is still in horrible shape, the country is still bitter from World War I, and because of communist revolutionaries, the Weimar Republic is on the brink of collapse.
This is so improbable. The Nazi party is not a national political factor of major importance until 1930, of minor importance until 1923.
The impetus for actual Communist revolutionary uprisings had been spent by 1923 already. The POD is too late for them.
Without the NSDAP, it is not a given that its voters would wander off to the KPD and play October revolution. Some would, yes, but that doesn't bring Thälmann's guys above 20%. The DNVP would still remain the strong right wing party, unless we have another populist, perhaps fascist right-wing alternative and we are back at the trope of Alt-Nazis.
Violent uprising of the reds? The Reichswehr didn't shoot on the SA, they would (and did) shoot on Communists.
So, without Hitler and his brand of totalitarianism, the question in the early 30s is:
- the Weimar Republic struggles and survives (quite possible if no charismatic Hitler as candidate prevents Hindenburg running again 1932 and you get a center-right president insteand...perhaps)
-a different right wing regime under
--alternate history fascist Germans
--monarchical restauration
--Hindenburg presidential regime
--Reichswehr coup
--combination of the above
-but most certainly no Communist Germany at that point