The collection of a body of images from internet sales has enabled the creation of a collected body of reference material that soon will exceed the printed references in detail and scope, to say nothing of accessibility. Looking at what has been accomplished in only 15 years - and compare this to the 70+ years RIC took to publish its ten volumes - imagine what the next 15 years will bring.
Computers facilitate communications and access to three types of information - images, text, and relationships.
The first two are obvious, the third one is the realm where real, physical reference books are still indispensible. Being able to leaf through the pages of a book and get an overview and general feel for a subject cannot yet be replaced, and may never be!