That's, um, more like anarcho-capitalism. Syndicalism is more, "everybody must pay equally into society but also has an equal right to decide how society operates". Hence, union membership is required to vote, but union membership is by constitutional mandate extended to every adult citizen. Stuff like that. Honestly, Canada should have no more than 11 million population at the start of the game. I can see like 1 million nobility, Royalists, military loyalists, etc. leaving, but given that the pre-revolutionary government must've lost most if not all of its legitimacy through gross incompetence to spark the rebellion in the first place, I'm not seeing how five million people (a ninth of the British population!) leave for Canada in a huff. Once grand systemic change is in place, people tend to resist further shakeups and get on with their lives unless placed under dire stress, since it's effectively the new status quo.