You know what... when you frame it that way, it does look like PP was a very effective leader of the CPC. He did an effective job of highlighting the weaknesses of both Trudeau specifically and of the Trudeau LPC in general. I mean, Trudeau/the LPC were doing it to themselves, but PP acted as a force multiplier. The end result is Trudeau is gone, and Carney is in power and if the pundits are to be believed, Carney has brought in a lot of programs/initiatives that a CPC government would have brought in as well. So, other than not getting to be PM, (and not getting to quash the "assault weapon" OICs), PP effectively "did his job".