Hans-Hermann Hoppe's book Democracy: The God That Failed, which I've owned since I lived in Miami (2002-04) and have recently been revisiting since a friend I'd loaned it to returned it to me, is interesting and useful, but depressing.
"...the transition from monarchical to democratic rule must be explained as nothing but a change in public opinion. In fact, until the end of World War I, the overwhelming majority of the public in Europe accepted monarchical rule as legitimate. Today, hardly anyone would do so."
Well, Prof. Hoppe, there are a few of us!
"On the contrary, the idea of monarchical governments is considered laughable. Consequently, a return to the ancien régime must be regarded as impossible. The legitimacy of monarchical rule appears to have been irretrievably lost."
Perhaps, but if public opinion changed once, why can't it do so again?