One of the problems that has become evident from witness testimony at the elections reform committee has been that certain kinds of changes to the system—I don't want to suggest all of them, but certain kinds—would potentially have to go before the Supreme Court for a reference.
For example, if you increased the number of seats in the House as a way of achieving some kind of additional list system—there have been suggestions to add, for example, 15% to the House—that might affect the proportionate representation of the provinces, which is guaranteed under section 53, if I'm not mistaken, of the Constitution Act, 1867, and you'd want to be sure before you proceeded that it was acceptable. Therefore, it is conceivable that you'd have a situation in which you would need to submit a reference case to the Supreme Court, and they would obviously take some time to respond back.
If this were layered on top of your attempts when you conceivably could start making changes and you then discovered they couldn't go forward, I don't need you to tell me this would be a problem, but the question is, how much of a problem? Is it a catastrophic problem, or is it something that could still be sorted out?