A quick scan of the transcript didn't let me find what makes his plan "viable". The system is so bad that almost any plan is a massive improvement, but such efforts often end in squabbling over which system is the best.
Here in Canada one of Trudeau's platforms was to get rid of first-past-the-post. But he nixed it when he found out the committee was going to recommend mixed-member-proportional (which would probably hurt his parties chances) rather than ranked ballots (which would definitely help his party).
Here in Canada one of Trudeau's platforms was to get rid of first-past-the-post. But he nixed it when he found out the committee was going to recommend mixed-member-proportional (which would probably hurt his parties chances) rather than ranked ballots (which would definitely help his party).