I'm pretty sure the decision to require truckers to be vaccinated at the border crossing or quarantine (no, they're not forced to vaccinate) came about around Nov 18th when Delta was ramping up. It's just that the implementation was not immediate. I think it made sense back then to try and figure out ways to generally increase the vaccine coverage. By the way the US has the exact same requirement (so even getting the Canadian Federal government to reverse its position here wouldn't change anything for those truckers).
Now with Omicron (for the last few weeks at least) it's clearly not needed any more, but governments move slowly, so it'd take a few more weeks. There's other restrictions that were put in around that timeframe that no longer make sense, like requiring PCR tests, and all those are on their way out.
This protest makes no sense except as a way of sowing chaos and seeking to destabilize the country.
Now with Omicron (for the last few weeks at least) it's clearly not needed any more, but governments move slowly, so it'd take a few more weeks. There's other restrictions that were put in around that timeframe that no longer make sense, like requiring PCR tests, and all those are on their way out.
This protest makes no sense except as a way of sowing chaos and seeking to destabilize the country.