The Liberals and Conservatives say no because under the MMP system it will come out of their share of seats.
Now Sheila Copps' idea of electoral reform is laughable to the extreme.
...France, for example, two votes are held to achieve a consensus. The first round eliminates all but the two major candidates. The second, a week later, is a runoff between the contenders, guaranteeing an outcome with majority public support.
Of course Ms Copps supports this, remember she was a key benificiary of the current system that gave her party 51.5% of the seats with 38.5% of the popular vote. Could there be a better system for the Liberals to turn 38.5% of first ballot support (if we adopted the French system) into seat count of about 75% under the two vote system.