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That is one of the issues with modern day monarchy

But there's one huge reason why monarchy doesn't really work anymore and why fascism has always been in opposition to it as effectively its modern day replacement:

Monarchs and aristocrats are inherently at odds with the bourgeoisie of both the petty and monied variety.

The monarch had to increasingly depend on taxes and loans coming from the wealthy merchant classes in order to pursue great infrastructure projects or wage war. In turn, this led to this bourgeoisie feeling entitled to a say in political matters of their nations, because it was ultimately funded by them. The political tool they found to make themselves heard is the proto-form of Parliament. The roots of the English Civil War are a good example of how that went: pitching aristocrats and the monarch who would not let go of ancient privileges against a growing class of people who held most of the wealth and felt entitled by it.

The growing discontent could either be a monumental disaster such as the case with the French and Russian revolutions or it could be beneficial (well, until recently) such as the case with the American revolution.

This doesn't necessarily have to be correlated with jews. It's more correlated with the natural growth of the bourgeoisie and middle class over the aristocratic class which is unavoidable with the growth of manufacturing and industry. Of course jews took advantage of it, they take advantage of everything, but the collapse of the monarchist system would have happened regardless of their meddling because that rift was wholly organic and growing by the minute.

Fascism solves the issue by being hierarchical but not effectively tied to an aristocracy which was at odds with the bourgeoisie. Furthermore, fascism is class collaborationist, which means that the bourgeoisie, laborers, peasants, and the rich all had a say in how things were done. This is in contrast to monarchy under which everything was relayed back to the head of state through the noble class. Fascism is the answer to the question of retaining hierarchy in an industrialized world in which the old hierarchy is no longer efficient enough to carry out its duties