That's where the possibility of not having the system be effective could work out. I think the most you can hope for, if this system is put in place, is that the Governor General will have enough knowledge about the rights and privileges of the elected members that he or she will be able to exercise the reserve powers in a way that preserves the rights and privileges of the House of Commons.
It's not going to be totally guaranteed, but given the fact that the Governor General will have sufficient information about what the will of the House is, I hope that will be sufficient. Keep in mind also that the other sanction is the political cost. If you look at some of the most important conventional rules, it's the political cost that has kept the conventional rule binding, in terms of the disallowance power, for over a century. It was only the political cost.