I agree that it was never a stable government to start with, as it was built to keep Germany weak after the treaty of Versailles. Mixed with the economic affects of the treaty that were placed on Germany and the global economic depression that came years later, it was doomed to fail. Inflation was so insane that kids would play with German marks and build stacks of them into pyramids! All of that along with a populous feeling humiliated and angry after WWI, the only thing that would have made it easier for the nazis would be simply offering them the reigns of the government.

Yes, the nazis weren’t popular at first, but to ordinary Germans, they seemed to have ideas to fix their broken world. They were the classic snake oil salesman, because what they offered seemed to fix everything, but in reality, they were only going to cater to the people they liked (which was a small portion of the population). The Weimar Republic, to a German at the time, was out of touch and doing nothing to help them.

So while it wasn’t necessarily set up to fail, it never had a chance. Similar to the Duma in post-Tsar Russia before Lenin.