Library design - flexibility and the future

A computer lab on the floor of Dakota Meadows Media Center, supported by in floor computer wiring and electrical outlets.
Red indicates under-floor conduit though which wiring can be run through the floor or the library.
About the only safe prediction about the future is that technology will change. Resources will change in format. Learning activities will change. Good school library design dictates that spaces are designed to be as flexible as possible. Running plenty of conduit and putting electrical outlets through spaces are still good practice. Try to place classrooms or other spaces adjacent to the media center so that they can be incorporated into the library if space needs increase. Or try to make sure there is an outside wall where an addition can be built if necessary.
At the same time, it's a mistake to design for technologies that do not yet exist, no matter how tantalizingly close they appear. E-books are not replacing print materials at this time. Wireless network access remains too slow, insecure and unreliable to replace Ethernet. Presentations are still given in physical space as well as virtually.
This "design principle" is probably the most important, but most difficult to practice. How have you seen library spaces made flexible and future-friendly?