Pretty soon, things like hotel keys, paper bills, and desktop computers will be a thing of the past with the rate that technology seems to advance these days. See how many of these common objects you don't use anymore to determine just how out of date they really are...
Lock the door and throw away the key, because those bulky jingly keychains are soon to be a thing of the past. With more and more people installing Bluetooth or fingerprint or app-operated security systems on their front doors, nobody is really carrying keys anymore. Even car keys are becoming obsolete. Technology is becoming a foolproof way to protect your home and belongings.
Along the same lines as house keys, who carries change anymore? Many cities are incorporating parking meter apps into their traffic system. If you download the apps, you can pay remotely and even add time to your meter from wherever you are.