The up-front cost of the key is another barrier. In some cases it may be easier just to keep getting codes from your phone, especially if you can get desktop text notifications with tools like MightyText or AppleApple's new Continuity feature. Alles zu Apple auf CIO.de
Still, FIDO plans to support more than just USB, including contactless methods such as Bluetooth Low Energy and near field communication, so authenticating in the future may not require you to press or insert anything. Sign-in support from a major Internet company like Google is, at the very least, a strong first step.