I don't know what their plan is once they get to Ottawa, but that city can't hold any more traffic, let alone 50,000 vehicles intent on disrupting life for the city. This is a modern day besiegement of the country's capitol by it's own rebellious citizens.

Canadians, especially in Ottawa, aren't nearly as tough as old world villagers. They will crumble after only a few days of the siege, once traffic grinds to a half for a few days.