This is another reason why proportional representation is a better system. One vote wouldn't matter because one vote wouldn't flip a riding or change the number and type of representatives who become MPs. After all, the percentage of MPs elected in the riding wouldn't change significantly enough with one vote.
The money and resources used for this one vote, along with court time and a potential byelection, make a mockery of our democratic process.
With proportional representation, we would have the same or fewer elections than we have now.
The fact that proportional representation reduces polarization and makes parties cooperative instead of adversarial is the number one reason I want it.
It makes countries more democratic and balanced.