It's not laissez-faire and it's not 'suddenly imposed'

If there's plenty of bandwidth to go around and existing providers impose caps, then new entrants will lease that bandwidth and provide residential customers with unlimited bandwidth plans.

Telecom regulations should prevent new entrants from being blocked from doing just that. If they are blocked (and the Canadian system isn't laissez-faire, so they shouldn't be), then you'll have an issue to gripe about.