already existed in Alberta and Manitoba (though I don't know enough about that history to try to say how it turned out).
That’s the parallel system where only some seats were proportional. No country ever had its citizens willingly vote away a proportional electoral system. Every referendum on returning to first-past-the-post has failed.
PR is not a magic bullet, no reform is.
If people want neoliberals, no electoral system will stop that.
Under stv the 2 big parties will actually face some real competition as Ireland and New Zealand has shown bold progressive policy in the past.