I completely disagree with this. The shift rightward was started in the '80s elsewhere (Reagan, Thatcher), and came to Canada in the '90s with Harris, Klein, and Chretien/Martin. Some of that was necessary, but I think they laid the groundwork for Canadians accepting privatization, lower taxes at the expense of services, etc., more than Harper ever did. The fact the Liberals experienced zero blowback for loudly campaigning in favour of deficits -- which would've been unthinkable a decade ago -- suggests to me that Harper was about as successful at shifting the discourse right as he was at everything else he did.
The Conservatives cut the GST because it
won them votes. Ascribing policy motivations like smaller government is giving them far more credit than they deserve.
It's a lot more overt than a mere undercurrent. In that respect, I guess, I'll agree that Harper did move one thing in a more conservative direction: he introduced an element of personalized nastiness to our politics that wasn't present -- or, at least, wasn't as obvious -- before.
Actually, thinking about it further, Harper's legacy, miserable though it may be now, could turn into something like "Father of Modern Canadian Conservatism", depending on how the next few years go. One former member of his caucus is a premier now. By 2019, that could easily be at least 3 premiers, depending on how things go for Brown and Kenney. I don't think he was particularly close to any of them, apart from possibly Kenney, but if that happens, I predict some will try to make that connection.