I'd agree with proceeding and also having a referendum.

I do not agree with any subsequent government rescinding the new system unless Canadians direct them to do so through another referendum.  That would be a colossal waste of time and money, which means that whatever system is decided on in the first go-round needs to be done right.  Doing it right needs a lot more debate than we've had so far.  I'd prefer that the referendum on electoral reform as may be proposed by this government be a question put to the public on the ballots of the 2019 election.