IMO the principle of mass customization is important to understand, both theoretically and practically.

There's no longer a "one-size-fits-all" model ... unfortunately, most organizations use management and developmental processes the principles of which are still derived from a "one model" era, even though consultants are often called in to tinker and mend.

However, I do think that the next two decades will be an interesting times to be an organizational designer-and-tailor ;-)