No, I don't think the voters establish conventions either. I think they're much more complex than that.
The point of these issues is that they can be argued in many different directions. Conventions, by and large, are loose. I mean, there are some pretty tight ones. For instance, if a government loses a vote that is declared a vote of confidence--that's a convention--then the government must either resign or ask for an election and dissolution of the House. That, I think, is about as ironclad as you can get, and it's very simple. But when people vote, I do not believe they vote on prorogation; they vote on the whole record of the government.
I mean, we're not, as they used to say in Russia, the working class united in objecting to the government's improper use of prorogation. Our working class isn't united. And I still suspect that there's a pretty high proportion of Canadians, and probably even politicians, who don't appreciate what prorogation technically is.