It's a danger because the minister would be allowed to close the door any time he or she chooses. Any government could do that when they come in. There's no predictability. There's no rule of law. Families applying to come could be told they are not allowed, that they're not the flavour of the time. That's why it's so important that this framework legislation of the act and the regulations be debated. Canadians can partake and let you decide the regulations. Canadians can hear and understand and have input. Maybe all of Canada will say we should shut the doors, but at least they would have an opportunity to participate. With a minister's instructions, it's not you or I. It's one person who makes the decision.
Evidence of meeting #41 for Citizenship and Immigration in the 39th Parliament, 2nd Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was c-50.
A recording is available from Parliament.