This is something that Simona asked me recently. To be honest, I'm not sure what the answer is. I don't expect that a large portion of the population will ever design a circuit or even assemble a kit. But perhaps it can provide for the creation of many products that would not otherwise have existed, and which have the potential of mass consumer appeal. The possibilities for industry are also fascinating, but something I know very little about.
I hope that in a few years I'll have a better answer to Simona's question.