Well, it will affect election results because there will be all kinds of different strategies and calculations among the candidates. You're not going to badmouth somebody else if you want their second-choice vote, for example.
I don't think it has any effect on voter turnout. I look at New Zealand. From 1946 until 1996, turnouts in New Zealand were from 84% to 98%, according to a website I've looked at. Since 1996, only one election has had a turnout higher than 80%. It's been as low as 74%.
I don't really think, then, that there's going to be any impact on voter turnout, and here's where I really want to be provocative in this. I'm not as concerned about voter turnout as most are. Professor Tanguay taught me that voter turnout has been declining in western democracies since the seventies, so Canada is not exceptional. It could be, also, that lower voter turnout actually reflects the fact that people may think it doesn't matter who gets elected; that the quality of their life, their material well-being, is not going to change greatly.
Now, there's another factor. Although youth vote at a lower rate, I would say that youth are more involved in politics than ever, but the involvement is expressed in different ways. They join NGOs. They join Greenpeace. They do research for the Sierra Club. They're engaged in issues, and data studies by Elections Canada show this.