These Austrians are certainly an inspiration to us all! Their experiments in government from failed monarchy, to aborted democracy, to Nazi Reich, to socialist paradise have been truly awe inspiring. Just look at the pinnacle that Austria has raise itself to in the last hundred years while America has been sliding down the tubes! :^)
Their Monarchy failed because we forced it to. Same as Germany's. President Wilson refused to deal with Monarchies during the First World War. Insisting on a regime change in both counties before we would consider any peace with them. That the Wiemar republic was unbalanced was only because it was more purely democratic even then our own system, political power was based on a total percentage of votes. It's often been argued that the Nazi's took over Germany extrademocratically because they never got a complete majority of votes, and had to form a coalition government. But as far as I know, no party ever got a full majority of votes. And since it was a choice between Hitler or Bolshevism it's pretty clear our entry into the First World War, and it's subsequent transformation into a crusade for Democracy, was the direct cause of Hitler.
People often express wonder that a culture, ostensibly as civilized as Germany's could descend into such animalism so quickly. It really should surprise no one. Germany and Austria were civilized under their Monarchies, and then were forcibly pushed into the democratic law of the jungle, and the result was Nazism (or theoretically Bolshevism, but will never know how that would have turned out).