Only the most naive Canadians would believe Trump so-called 'tweak'. Everything from America is war, or war-like. Under Trump get ready for nukes. 

As long as Canada let so much of its export go to the U.S. it will be subject to U.S. imposing the terms. NAFTA or not. In many ways, Trump exiting NAFTA will do a lot of long-term good for Canada. For sure there will be a whole lot of short-term pain as Congress or USTR imposes anything they feel like. But it is precisely this pain that will propel Canada to implement a more sound diversification strategy with urgency. Make us grow up. 

There is however one naive thing Canada permits. And that is allowed unfettered U.S. investment and access to Canada. Buying up a whole lot of things.