Traditional distance learning media, including teleconferencing, text-based courses, audio courses, video courses, and text-based training all can help -- but each has drawbacks and can't solve all the problems mentioned above.
Web-based training that is designed specifically for the metalworking industry is already on the scene. Tooling University (www.toolingU.com) gives you a good idea of what web-based training has to offer. Other sources are bound to follow, giving the metalworking industry a head start in the race to meet the training challenge.