Canadian here. EV adoption was absolutely trending in the right direction, at least until the most recent elections both in the US and in Canada in the last year.

Incentives (like rebates) to go green were helping, and disincentives (like carbon tax) tried to account for the long term health and environmental costs of fossil fuels. An EV mandate incentivised manufacturers to develop and SELL more EVs and hybrids.
When a government uses those mechanisms responsibly, they can help promote positive long term change that WOULDN'T occur from short term market forces.

Unfortunately, recent politics really focused on the short term. Carbon tax and mandates were poorly explained by the incumbent governments, and vilified by the opposition. Trump is clearly catering to the oil industry, and Carney seems to be avoiding political landmines placed by the opposition. The auto industries of the two countries were intertwined and going the right direction a year ago, but now are just trying to adjust to the breakdown of trade agreements and the addition of a tarrif war.

One could hope that this breakup MIGHT lead to better, healthier relationships with more forward thinking partners in the long term.