Others have duly criticized the Star's editorial on electoral reform. [Update: See e.g. Dr. Dawg's takedown of a few misleading pieces.] But I'll argue that it can be brought in line with reasonable expectations with one important change.
Simply put, it's not a problem to insist upon "broad consensus" on a new electoral system. The problem lies in defining that term - and it's here that the Star goes awry in interpreting it to require the support of all major parties.
That restriction would of course allow a single bad actor to thwart any effort to improve our electoral system. And the Bad Actor Party of Canada has thoroughly telegraphed its intention to do just that no matter how undemocratic the means - meaning that the Star's interpretation would indeed rule out any reform, no matter what the Libs have promised or could achieve.
If, on the other hand, we instead see a "broad consensus" as meaning general agreement among a range of different parties - or even all parties who engage in parliamentary consultations in good faith - then a new system should be entirely achievable. And that's the standard the Libs should see as necessary to support the electoral reform they've promised.