All parties switch to liking FPTP as soon as they become in a position to be able to modify it. It's always like that! Yes, I'm cynical, but I'm also right
A more realistic way to "fix the problem" would be to get back to two political parties. The flaws of FPTP are perfectly bearable then.
Interestingly, the PQ and PLQ could each absorb almost all other parties.
The only pairings that can't work:
PQ and PLQ can't merge;
CAQ and QS can't merge;
PCQ and QS can't merge.
All the other merger combinations are within the realm of the possible.
Some examples:
CAQ could easily swallow the PCQ;
Then with the rise of the PQ and the CAQ bleeding half their support to it, it becomes a smaller-than-before, mostly federalist, pro-economy party, and thus a good fit for a merger with the PLQ;
Meanwhile, the PLQ would absorb QS (both being very urban, woke, very Montreal-based parties and good fits on many issues).
So in this scenario, PQ vs [PLQ + CAQ + PCQ + QS]
And the opposite extreme,
CAQ swallows PCQ (easy fit);
PQ restarts the merger talks with QS, prevails and absorbs it (QS having a hard ceiling at 15% ends up preferring some share of power within a bigger tent PQ)
PQ merges with CAQ (Ministers Drainville, Legault, etc. going "back home" after resoundingly failing their autonomist experiment...)
And in this scenario, PLQ vs [PQ + CAQ + PCQ + QS]