From what we know in Ottawa, overall the number of clients approaching sex workers on the streets has not gone down. I know this anecdotally. I don't have any research to back it up. But clients are displaced for periods of time while they are conducting what they call the street sweep. For that period of time they may move to another location, but it certainly doesn't change it long term.
On July 8th, 2014. See this statement in context.