Lorne Sossin passes along his thoughts.
While the optics of the NDP proposal strike me as appealing, I do not think such legislation would be enforceable nor do I think it is the optimal solution. A vote to prorogue seems to me to some extent redundant—the opposition parties can bring down the government if they have lost confidence, and otherwise, if they continue to have confidence in the governmentt, they must live with some degree of executive prerogative. In my view, the better accountability mechanism is a Governor General who exercises discretion with respect to granting or denying requests to prorogue with the public interest in mind, and makes public her or his reasons for granting or denying such requests. The Governor General should make clear that prorogation will not be granted so as to avoid a vote of confidence, or for ulterior or improper purposes.