I don't have the numbers, but I think when a parlour closes somewhere, another one is opening up. A lot of areas are paralyzed by neverending construction work too, that's bad for any type of business.
The massage scene is not an issue in this campaign. Coderre's councilor/liar/crazy person Anie Samson soon realized back in 2013-14 she couldn't do much against MPs. As far as I know, Projet Montreal steered clear of the issue.
I think a woman mayor might be better, in the sense that she might understand better than the apparent quick fix ("let's put a lock on their doors") don't do shit for a complex issue from the perspective of women, their right to do what they please with their bodies, and their economic situation.
I don't think the upcoming election will have much impact on the rub'n'tug scene, but I trust Valerie Plante more than Denis Coderre and his habit of pushing dumb "common sense" bylaws that his docile little minions will vote for without standing up to him, and then will defend in the face of logic just to avoid admitting a mistake. Coderre could read Journal de Montreal one day and go into a populist crusade without thinking, because he's emboldened to do what he wants. This guy's bad news.
But again, I trust Valerie Plante as a person and as a politician over Denis Coderre on just about everything.