Canada's formal withdrawal from Kyoto will have consequences for Canadian foreign policy and relationships with other nations. It places the Harper-led government at odds with nearly the entire rest of the world, which is desperately trying to find a solution to the commons problem and issues of fairness that are hamstringing climate talks. Canada is not withdrawing in good faith; we are withdrawing because a bunch of older angry white men high on functionally obsolete economics don't understand what's at stake.
We may find other states punishing Canada through trade barriers, passport restrictions and other measures. At home, the public, and other levels of government may well push forward with their own climate initiatives. Some legal, some acts of resistance and sabotage against the tar-sand driven oil economy.