If we're talking realpolitik, the NDP should have known that PR would be a non-starter in the committee. They swung for the fences and whiffed. Had they thrown their weight behind something like STV we would be having a different conversation. Rather than make them an offer that was difficult to refuse, they made one that was easy to reject.
Except in the committee's report, the Committee itself said that if we are going to do Electoral Reform, it has to be a form of Proportional Representation. Its what the Electoral reform community in Canada wants, its what experts all around the world (including within Canada) say is the ideal. Within the Electoral Reform Committee's report, they outlined three specific systems as what we should look at. STV, MMP and Rural-Urban Proportional.
Seems like an expensive exercise in making people feel good? If fringe parties can never matter than what are we really losing by not including them? I don't really want to pay for Jhonny Racists pension because he managed to pick up 3% of 45 ridings. I realize you can set limits to how much support someone has to get before they qualify, but again why?
As we see in countries around the world which utilize Proportional Systems, extremists tend to stop trying to take over electable mainstream parties when they have their own they can work towards.
Not to mention when it comes to proportional systems, even with systems more likely to elect extremists (MMP), nobody within the Electoral Reform Community is advocating for 100% Proportionality. We all take the idea that you follow what countries like Germany and New Zealand do with their MMP systems which is put in a minimum goal for Proportional Seats rather than what countries like Saudi Arabia do with having it be a free for all. AKA what the Canadian Electoral Reform community advocates for is if you can't get 5-10% of the vote you don't get Proportional Seats.
Alternatively you have STV where the vote is still proportional, but only up to the number of MPs in a riding meaning there is even less chance to elect extremists than the most restricted MMP system.
The extra benefit of Proportional Systems include that we don't have to have the current Big-Tent parties that we have. The Conservatives can split back into their root parties of Reform and Alliance and as a result you don't have Conservative MPs ignoring what their constituents want because it doesn't fit with the current "Conservative" banner of the day and you wouldn't be forcing say Progressive Conservatives to vote for a Conservative Party headed by a Social Conservative because they could just vote for the Progressive Conservative Party. Vice Versa with Social Conservatives. They would be able to do this without ruining their chances of being elected as government because they would be able to coalition if their percentage of the vote wins out.
I've harped on this before, but I'm also deeply uncomfortable with giving MP jobs to people who either didn't win one (and thus were rejected by the electorate they stood in front of), or didn't try to win one. That's just me, but I can't see any way these 'extra MPs' aren't just also-rans and party cronies..
Except these MPs are elected. Nobody is advocating for Closed List PR where the party chooses their candidates in the order the politicians want them. The only time it is thrown out there is when people try to make the argument that the ballot is too complicated. The Electoral Reform Community advocates for Opened List PR (in the case of MMP) where you select or rank the candidates on the Proportional Ballot in accordance with your choice.
This point is even more moot if you go with STV where you just have a single ballot that you rank all of your candidates on with the redistribution process being Proportional. Under this system there is no Party List and all the candidates are elected by the results of the vote.