The idea hasn't had a high profile in Canada yet, so it's hard to judge public reaction to it. If it makes it onto the Conservative election platform this year then it will get a better airing and so public reaction will be easier to judge. The whole question though is very theoretical unless and until the UK actually does Brexit.Polls have shown a majority in favour in Australia and New Zealand and while not official party policy, Simon Bridges, current leader of the NZ opposition (and largest party) has expressed his support. The people who seem the least keen on it, according to polling, are us.
The opposition are unlikely to be the opposition forever. More to the point though, neither of the biggest two parties are shy about stealing each other's policies if they look to be popular as the basic differences in outlook between them are very small. There is nothing in the proposal which I can see the current government having philosophical objections to. The difficult questions will be in the details, and that applies to all four countries and all parties.With regards to Canada and the opposition policy, nice but can't see them ever getting in any time soon.
I've no idea if the idea will go anywhere, it came as quite a surprise to me when I first heard about it. However, when it gets the active support of people who have actually previously held cabinet portfolios such as trade minister and minister of labour, then I have to take the idea seriously.As much as I would love to see this happen, I suspect it will come to nothing much. I'd vote for it though.