I agree with your first part, not so much with the second. While we are very dependent on US trade, the reality is that the US needs our raw materials and what not. We've always focused on trading with them due to convenience, I mean, it's literally a few hours drive for most Ontario-based manufacturers to the US, and we have a very integrated rail and trucking system.
But, that being said, Trump has killed any faith we have in the US being a stable trading partner going forward. I mean, even if he were to drop dead tomorrow, the fact that the US could elect someone so unprepared or literate enough to understand global trade (or, really, not understand it) means that we cannot rely on the US. That is why Carney is working on deals to make closer ties with Europe, Asia and Africa (and South America, I guess).
Here's the thing though: Those trade deals will not be done overnight. It will take time. I know some folks on here think that any deal made is a failure. And, it could be. But, at the same time, it could just be a stalling tactic that will act as a placeholder until other international deals are solidified.
And, here is something else to consider: Say we allow more US access to our dairy market. What are the odds that in this day and age Canadians would buy American? I mean, there was a fairly large quota the US could use to send dairy north...but they've never come close to reaching that amount. So, increasing the quota might mean absolutely nothing but give the appearance that Trump gained some concessions from Carney.
Finally, I haven't really been following this thread, but I would like to point out the BS coming from PP regarding this stuff. He seems to think that he would have been able to have fixed the trade dispute with Trump months ago...with absolutely no evidence. He mocks Canadians for voting for "elbows up," yes he has not shown any backbone to the US. So, what would HE have Canada give up to make a deal? He's pretty quiet on that front. Now, in fairness, I honestly do not think PP would do anything that would hurt our economy (well....I'm 85% sure), but I'm also 100% sure he would likely be in the same space as Carney right now. Maybe below, because I'm not sure he'd be able to work with Europe as effectively.