There's also a lesson the left should have learned by now. To change the voting culture, you have to change the media culture. Without a bigger voice in the fourth estate, the left's chances of making a breakthrough are minimal. The Reform/Alliance party eventually hit pay dirt, becoming the dominant force on the conservative side, because big media promoted its religion.
The CBC has a leftish reputation, but try finding anyone among its top TV commentators who trumpets NDP values. Rex Murphy leans right, Andrew Coyne is predominantly conservative, Allan Gregg has been anchored in the Tory party for decades and, among Chantal Hébert's many colours, pink is not prominent.