Let's get a few things straight here. First and foremost president Trump (what an awesome feeling to be able to say that in the present tense) did not cause Justin Trudeau's resignation, unlike what a lot of Americans are saying. I'll explain more in a minute. Secondly, as much as I'd personally be tickled pink with it, Canada is not becoming the 51st state at least not any time soon.
Trump didn't destroy Trudeau's reign in Canada, Trudeau managed that all on his own. He was destined to be absolutely destroyed in the next election in October 2025 and he accomplished that all on his own. His polling has been abysmal for about two years now. His coalition government was already falling apart too, and he may not have made it to October anyway.
However, it's certainly fair to say that president (elect) Trump helped accelerate the downfall. Many, many Canadians can appreciate him for that. Some of us will appreciate him for a lot more.
As far as Canada becoming the 51st state, I understand that it's just very effective trolling but not only shouldn't it be taken seriously, there are a few reasons it's likely impossible. Firstly, while a lot of Canadians would be thrilled at that, far more Canadians want Canada to be Canada; even the ones who like Trump and love the U.S.
Secondly, if there is a 51st state wouldn't it be Greenland? It's more likely Greenland, should it be actually on the table, would become a protectorate and not a state. But if we are talking states, that's more likely a primary objective than Canada. Then there's Panama. Strategically Canada is less important than either of those other two. If anything, Canada seems more like the 52nd state. Or maybe even joined to Alaska as part of the 50th state instead. That's all geographical semantics though.
Thirdly, Canada is so geographically vast, it would require more than just one state. It also makes sense to break that up; Alberta for example is reliably conservative and basically Texas north. Do you as a conservative American want to add a single state that has enough population to gain approximately 50 electoral college votes and tends to lean left? It would make more sense do break that up. While the mood in Canada is currently pro-conservative, that is not universally true. A split Canada into multiple states is definitely more balanced electorally.
All that aside, Trump's handling of Trudeau has been masterful, purposeful and did help achieve it's intended effect. My greatest hope as a Canadian, is that Pierre Poilievre is elected as soon as possible and he and Trump develop a terrific working relationship. They are predominantly aligned on political philosophy and an economic union could be something that works out even better than a 51st state.