With society becoming more left-leaning with the growth of the NDP, this will pull Conservatives more to the left perhaps creating a void on the right that the PPC may fill.
For now, the PPC is irrelevant, but that may soon change. Only time will tell.
I understand the appeal of ranked choice voting for citizens, but I don't see either the Liberals or Conservatives supporting it.
On the Liberal side, they will always have the idea of strategic voting, where they tell progressive voters "A vote for the NDP/Greens is a wasted vote that will get the Conservatives elected."
On the Conservative side, the next closest party is the Liberals. So their voter base will choose Liberals as their second option (Assuming the PPC is irrelevant).
[0] https://www.youtube.com/watch?v=DXAXabAzbk0