I can tell you that in the case of Quebec, when we started we had different studies showing that electoral reform would not change turnout at elections. That was not something we could take for granted. In other words, the turnout would almost be the same. If we had to change our electoral system, it would be to promote other values, such as the participation of small parties, the expression of diversity in the House, and so on. But the studies, at least, indicated that there would not be a major change in turnout.
On August 22nd, 2016. See this statement in context.