Despite how bleak things are looking, how likely government crackdown & overreach may seem, and how doomed all dissenting Canadians may be. I can't help but feel that the liberal government is doomed too. Even if the Emergencies Act passes.
Perhaps it is nothing more than a massive cope. A cope that can be seen from space. But I don't think they could actually get away with this.
Canada values it's international image so much. The liberal party especially. What they've done already has garnered international scrutiny. When people get bored of the eternal nothingburger that is Russia vs Ukraine they turn to watch Canada's spiral into authoritarianism. If there are serious crackdowns on dissidents then the global stages they love to grand-stand on will shun them, if not sanction them. Possibly worse.
But more importantly: The Canadian people realize they aren't alone. And that's a genie that can never be put back in it's bottle. Even if protesters & funders are rounded up en masse there are now hordes of disillusioned centrists & a ton of right-leaning Canadians who now feel bolstered & vindicated by the fed's response. The liberals have no chance at re-election.
("Just vote, bro!") 
They can't arrest everyone that dislikes them. And any attempt to do so or suppress voters would blow up in their face 10x as hard. They would have to sacrifice EVERYTHING and go full CCP to secure the vote. Which, while I can see them trying, I can't see them succeeding.
In truth it will most likely be a relatively non-violent transfer of power. After about 2-3 weeks of inhumane authoritarian rule him & his cabinet will be ousted one way or another. Either by by courts, parliament, the people, or perhaps even foreign intervention of some kind. Up to 500-1000 people will be arrested. Most dissidents will be released and receive no reimbursement for their suffering at the hands of the feds, and the organizers may never see the light of day again. But Canada will most likely return to it's pre-covid state: Kinda cucked yet functional.
Again, maybe it's my last cope, but the night is always darkest before the dawn.