One thing that would happen would be a complete reduction in party discipline. Members would be more free to vote according to their constituents views since you no longer have a situation where a majority government rams through legislation. This also necessitates horse-trading in order to the leading party to pass legislation. I think this is better because with majorities, there are no checks and balances other than the opposition.
Another possibility if there is no overwhelming majority is for non-governing party members to become cabinet ministers. Confidence criteria would have to be clearly established because legislation would be defeated regularly without the government falling.
Essentially, PR is more representative of voters but less efficient. Governments will really have to work hard to reach consensus. I would prefer this over a plurality where backbenchers are sheep who vote with their eyes closed.
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