Probably, but that has nothing to do with the internet.Won't trafficking end when it is no longer profitable?
Look at the movie "The Taxi Driver" for example. Does the pimp force Iris to take nudes and post them on backpage? No because it doesn't exist yet. And still there is a 13 years old away from home.
There will always be demand for prostitution and guys willing to offer money so it will always be profitable. Prices can get lower or higher, but there are foreign people being exploited as house slaves oversea and its not like cleaner is a well paid job so i dont think that fixes the problem.
Better is to legalize everything and give girls the feeling they wont be judged if they ask for help, and also have people inspect brothels and agencies to see if the girls seem ok.