Ok, who fills those seats?  Do people get to vote for which individuals they would like to see make up those 30% of seats or do the parties decide? Are they going to represent a riding or are they only going to represent the party they are members of?  Will the role of an MP be reduced to that of a simple messenger to carry the party will in Parliament?

And our Constitution defines representation by Provinces, so how do you adjust national numbers to a Provincial level or do you do proportional by Province?  How do you handle a party getting something like 22 or 23% of the vote in PEI where they have only 4 seats?

... and for whatever we decide to the above questions, is a Constitution Amendment required to make them a reality? (hint: the answer to this one is probably "yes").