The election of Justin Trudeau to the leadership of the Canadian Liberal Party gives me pause. (Note to those not familiar with Canadian politics: his father, Pierre Trudeau, was Prime Minister in the late 1960s and 1970s.) Former Prime Minster Paul Martin's father was also a highly successful politician, though never Prime Minister.
In the United States, the presidencies of the Bush family, and the prospect of a second Clinton presidency, give me similar pause.
Passing leadership of a nation within a family was the defining property of monarchies, not democracies.