The discussion focussed on the entire technological stack; and I do not think that anybody claims that we will be designing and printing comercial airliners from scratch at home. By contrast the maker revolution is (in its first stages) about the long tail of manufactoring. So in the forseeable future it is about beeing able to sell small runs of specialized goods at prices compareable to more generic and mass produced competition. While we still need several million people to produce the arduinos that power them.