I was recently advised that for Canada, you pay taxes based on residency (lots of information online re what constitutes residency for tax purposes). The situation however with US Citizenship, apparently, is that if you have US Citizenship, you have to pay taxes on foreign income, period. There are others on this forum who are more knowledgeable than me on this topic.
Being in a high demand job myself, I have also considered living and working in both countries. However, to keep your Canadian/Provincial Health Insurance (which seems to be the most prominent concern for Americans currently), you have to stay in Canada for x amount of days every year, which will make you inevitably a resident for tax purposes in Canada.
There are some people who work physically in the US, but are employed by Canadian companies. This will make you a US resident for tax purposes (remote work for tax purposes in the US is based on where the company is based, not where you live- information about 2 years old).
Since it's tax season, I'm a bit more clued up, being a Canadian, working in the US right now. As I said, there are way more knowledgeable people on this forum. I believe @OutOfSa and @Jules may be able to better assist.
Imho 1) No 2) Yes, but they've taken away NAFTA. Not sure how that would work now. 3) Long term: Where will your kids settle? Are you and/or your wife prepared to be separated from them long term. Moving opens door for kids, but could also spread out families. In the US: What does your 401K look like? Have you paid into social security for 40 quarters? In Canada, you will have to pay into the CPP for ten years to receive benefits and also build up an RRSP, which may be challenging at your age. (No offence, I'm older than you)
I would suggest calling the airport where you are flying into for the most current information. Pearson in Toronto has been very helpful to someone I know and also very friendly. They had no problem finding a car, however, finding a place to stay to self-isolate was challenging. In the end they did find something. Nelline is right, you can order in and they will deliver to your door.
I just found helpful information from this webiste:
The only thing in relation to climate change that this current crisis is proving is that if we don't pollute so much the air, water and everything is cleaner and that the animals that we push away really appreciate our current absence.
The economy is in ruins because we are us unable to manage this crisis as we are at managing our planet.
What I don't get is that it is in our best interest to have cleaner air, water, not wipe out fauna and flora, but we keep on bitching about it as if it will murder us in our sleep instead of just getting on and doing it.