What's a good election system?

You hear a lot of talk about the possibility of the U.S. presidency being held by just two families for 24 years. People say that this makes the U.S. seem un-democratic. I would agree that having two families in power for that long is not a good thing. However, I think the U.S. primary system makes politics open to outsiders than most democracies.

When you think of governmental systems like in Canada and the U.K, power is usually kept within a small group of people for most of a generation. Gordon Brown and Tony Blair have been political partners for a long time. Going from one to the other is a lot like transferring power to a son or brother. Trudeau was in power for a good part of a generation.

And things aren't looking that great for Hillary now days are they?