I see your point. My answer is it will depend upon whether or not someone who voted for Harper in 2006 believes that he has broken his promises. For instance, when I look back at the Federal Tory platform I voted for in '06 (http://www.conservative.ca/media/20060113-Platform.pdf) I note that Harper has accomplished something across all of its 5 points:
Accoutability - Finally, an Act of Parliament which sets us on a course toward making Ottawa reveal what it is doing with our democracy and our hard earned tax dollars. Obviously the Accountability Act is a direct response to the Sponsorship scandal and the inference that had such an Act been in place in the late '90's, the Chretien government would not have been able to so easily manipulate the system for their own political gain. But its real long-term value to Canadians is it will move us away from just blindly trusting that Ottawa knows best without applying any scrutiny. And in our system where huge majorities (i.e. Chretien; Mulroney) are possible from time to time, an Accountability Act will give even a weak Opposition the tools to look into dark crevices.
Tax relief - I can think of several ways in which Stephen Harper has lowered taxes.
Security - From creating harsher penalties for a host of crimes - which I believe most Canadians agree the Chretien/Martin Liberals were too soft on (remember the guy in Vancouver who claimed his Charter Rights would be infringed upon if he couldn't keep child ponography?) - to reviewing the gun registry (again, instead of just blindly trusting in its effectiveness), to securing our borders and trying to work closely with our American allies.
Families - The $100 a month per child tax credit is designed to accomplish two things: 1) To stimie the Liberal/NDP/BQ plan for another expensive and typically unaccountable social program (i.e. Universal Daycare) and, 2) To provide yet another tax break to all Canadian households who on average earn $59,000/year and could use $1200/year or more depending upon the number of kids at home.
Communties - This section of their platform deals with infrastructure and the environment which is the weakest area of their accomplishments to-date. But the Clean Air Act and the public transit reimbursement program are good offerings regardless. I live in Toronto and gave up my car last November for a subway pass.
The reaility of the environment issue is that government can only do so much in the short term. To think of a comprehensive environmental plan which addresses either the deep challenges of changing industrial standards quickly, or building a national public transit policy or the economic impact or the lack of concern for this file from growing economies such as China, India and Russia - to name a few hurdles - means that much of the short-term gains on the environment depend upon personal responsibility rather that an expectation of a silver-bullet government program. And personal responsibility is a cornerstone of Conservate political thought.
Canada - Fixing the fiscal imbalance and strengthening Canada's federalism are two sides of the same coin. The old system of transfer payments which Harper would like to fix keeps the Provinces beholden to Ottawa while perpetuating that power vaccuum which sees Ontario and Quebec hold all the cards. Harper's plan is to get the money out of Ottawa and into the hands of all Provinces as step #1 toward decentralizing Canada in a way that will positively impact our country in the 21st century across the areas of: our economy; our social values; our culture; and our long sought after national identity. In other words, if we give the Provinces power by giving them the capital to weild that power, we will see all areas of Canada stand on their own two feet, grow into what they are good at and raise their regional idenity which in turn will enhance our national identity.