Here, expanding on this post as to the Harper Cons' choice between short-term tactics and long-term viability.
For further reading, Jamey Heath argues that the Libs are serving only split voters who have a common interest in change, and that the progressive vote should coalesce behind the NDP. But in contrast, Don Lenihan theorizes that the content-free brokerage model long associated with the Libs is set for a comeback dressed up as "open government".
That said, it seems that there's one possible outcome of this fall's election and its aftermath which fits all of the above pieces together. It may be that the NDP can both form government immediately, and position itself as the long-term progressive contender for government. Yet at the same time, if the Cons' brand is repudiated thoroughly enough by voters, the Libs may well offer a more promising right-wing vehicle for all but the most fervent of Con partisans.
So Stephen Harper's goal of Westernizing federal politics might take us...to the NDP/Lib dichotomy which is already the default in British Columbia.