Until Mr. Trudeau brought up electoral reform as one of his many promises during an election campaign, the only people who had been talking about it were academics. 
Trudeau's election victory and entry into power quickly led him to choose the more relevant and doable promises - not electoral reform.  To open this bag of worms for  reform would literally take up years of political time, dominating all parties' actions and siphoning away so many of the other, more relevant issues facing the country.  All goes well. Canada is admired as a democracy. Why play with all of that?
P.S. Senate reform/abolition has hovered around Ottawa for decades. Let's look at that first.