Considering that your response relies heavily on deciding who is or isn't "demotist", it might help to address Yvain's criticism that the idea isn't a well-defined one. The issue of monarchs who claim to speak for the people is a serious one. Simply labeling dictators one doesn't like a demotist doesn't really do much. Similarly, your response also apparently ignores Yvain's discussion of the British monarchy.
It's just a small slice of a response, I can't respond to everything at once...
Napoleon was a populist Revolutionary leader. That should be well-understood.
For something more substantial, try "Democracy: the God That Failed" by Hans-Hermann Hoppe.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.