Sure, the new one might turn into one too, but that's no reason to stay with one who is definitely one.
Trust arrives on foot and leaves on horseback. That's the obvious result of Trumpism - when you seek to turn every interaction into a short-term win for you, people simply stop doing business with you whenever they can avoid it.
Tens of millions of Americans voted for this guy three times, overwhelmingly twice - this is how the country wants to act.
If he and his cronies are removed from power and prosecuted and everyone pinkie swears to never go down this road again, maybe we can look into rebuilding some of that trust. In the meantime, you reap what you sow.
Canada can't solve this problem inside US politics. Only Americans can, at any one of the three boxes. It can only work to disentangle it's critical dependencies, and to protect its own interests.
Any country can elect chucklefucks or vote for something stupid. Some of them have systems that are more resistant to the long-term damage they cause. Some of them are less. The US is definitely in the 'less' category as all of the checks and balances and systemic inertia completely collapsed.
Also, the other big difference is that when Hungary or the UK sneezes, Canada doesn't catch a cold.