system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is Justin Trudeau backing off on his promise to reform Canada's voting system such a huge problem?
gpt
It is because Trudeau was not getting his preferred option. 

A proportional representation government, as was endorsed by the other parties, would pretty much guarantee there would never be another majority government in Canada.  Coalition governments would become the norm.

Trudeau's preferential ballot system would have pretty much guaranteed a Liberal majority government for decades and so he could be prime minister for as long as he liked.

When Trudeau realized what was going to happen he immediately backed off so he at least had a chance of having a majority government.