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It may be just around the corner - wireless transmission seems a possible way to go once some still significant problems are ironed out. IBM was working on some sort of wireless transmission using optical signals as far back as the 1960s, and 50 years later we are still looking at it. It is going to require moving huge amounts of data across wireless spectrum, with the same requirements for reliability that are expected from current fiber optic cable. Personally, I think it would make more sense to alter the accepted data center hierarchy, so that there aren't tons of hubs feeding into tons of routers in a pyramid fashion, which is just about perfect for creating the opportunity for bottlenecks. But that's like saying I think cars should have six wheels - maybe that's a great idea, but it wouldn't be easy to change the paradigm.