The argument made that the Bloc and the Green Party should have a vote in the Canadian House of Commons (HOC) Committee to propose a new electoral system is, in my view, without much merit. If it has any, it is more so in the case of the Bloc with ten seats and 4.5% of the popular vote, than the Green Party with one seat and 3.5%. The Green party member could be considered an independent MP who happens to be associated with a party. In the future, any elected independent MP could claim some party affiliation to gain membership. In the 2015 election there were candidates from 18 parties other than the 5 with seats in the HOC.
This is an illustration of what could happen with an electoral system using proportional representation. Debate to-date assumes that only the five parties who at present have elected members will run candidates. If that was the case, then these parties would get more members elected at the expense of especially the Liberals and the Conservatives. But that will not be the case, as other parties will spring up, and the HOC could look like a case of measles with an array of parties, and increased difficulty in getting a majority vote on anything like a budget, unless each of the parties is bought off with taxpayers funds. To see what might happen watch Borgen on TV, a Danish series based on what takes place in the Danish parliament where there are many parties.
If there is change to the existing system, then some form of preferential voting appears preferable, where elected members retain links to ridings. Proportional representation, in my view, invites disaster for the governing process, and has not been favoured in referenda in several provinces. No province appears to be making any changes, suggesting that the present system is probably the least worst of those being considered. Regrettably, no party elected on a platform of electoral change can be seen doing the sensible thing and not making a change.