Even kids who do take dance instruction mostly do not take ballroom. Jazz and Tap and the Hip Hop classes are popular. We have one young lady in our studio, but her parents also take lessons at the studio. I have no idea if there are others taking lessons during the day.
It would be nice to see the program they have in New York spread across the country, but I'm not foolish enough to hold out any hope for that.
The problem with the studio system is the cost. You are not going to appeal to the general populace at the prices the studios charge for lessons, and you are not going to get the scale of economics to reduce the cost unless you appeal to the general populace.
So, in my opinion, advertising alone is not the answer here, because advertising won't get parents to pay the prices the studios want. There needs to be a push to get kids into some sort of ballroom instruction, and it needs to be priced at the same sort of rate that the jazz classes are priced. When you have a product that parents are willing to afford, then you have something to advertise.