I think Asia is a really hot potential market for this, so is Latin America, Africa and other emerging markets.

I'm all the way in Mexico and yet I've managed to get a hospital, a barbershop, a taxi company, a boutique and just today I think I got a print shop. No small business owner would say no to this. It's literally free advertising of products they have for sale already. It's advertising delivered directly to paying customers with money in their pocket that they are desperately looking to spend on those specific products.

Think about it this way...
What good is a billboard when no one looks up from their phones anymore?