I feel that one's predisposition towards a monarchy depends very much on one's background. Many of the Americans in the discussion had ties to or prior experience with a monarchy. The narrator/report has Scottish and Canadian parents, which makes him no stranger to the Crown.

However, many Americans have zero experience with living under a monarch, and based on the manner and reasons under which the US was founded there's an inherent distrust. Despite the fact that the Queen seems like a perfectly wonderful lady and a credit to her country, I think most Americans couldn't fathom the idea of the US under a king or queen. It's ... un-American.