A referendum is not a good way to decide this very important question as most Canadians have not truly educated themselves on the pros and cons of each system.
None of the alternative systems resolve the complaints by those who want change and with those systems come more problems than with First Past the Post.
Arrow's Theory proves that not every vote will count no matter which system one chooses.
The Liberal MPs meetings were shams in which Liberal volunteers were invited to fill the room along with the vocal interest groups that want proportional voting.
Proportional voting will not give Parties proportional power like they think will happen.  It forces the Parties into coalition which means that the strategizing voters do at the ballot box is just shoved up the ladder to the Parties in the House of Common and they make the decisions for you.
Trudeau's campaign declaration to end FPTP was folly from the start as the Canadians who wish to keep FPTP have been ignored.