I wouldn't want to say definitely one way or the other, but it's an excellent question.
I mentioned the municipal election in Montreal a month ago. The incumbent mayor decided that only one debate would be held and that the chamber of commerce would organize it. Radio-Canada and TVA weren't pleased with that level of control and opted not to broadcast any of the debate. It was a missed opportunity for democracy.
It may be worthwhile to seriously consider whether at least one broadcaster should be required to broadcast the debates. As for whether everyone should, that is up to you.