It's completely expected that under the electoral system we have there are psychological and mechanical effects that create disincentives for people to vote under certain conditions. If you live in a riding in which the Conservative is going to sweep it and you're an NDP supporter, what's the point of voting? It's not a big surprise at all, so some options for reform would address these sorts of things.
On September 20th, 2016. See this statement in context.