Keys -- well, not really. One thing that keys have over electronic or mechanical locks is that when electronics fail, you still have an alternative to unlocking the door. This is why steam-powered mechanical devices such as Dean Kamen's slingshot water purifier may become even more popular in the future. We always need an analog(non-electronic option)for our devices. This also means analog dashboards for our vehicles as an emergency alternative to our holographic dashboard controls. Keys and joysticks will never die.

Cash will go away and all the things related to it, but official physical signed documents will not go away. Banks will still be around for that.

Desktop Computers, TVs. Well, they'll go away just because you'll be able to take off your computer mixed reality glasses to project a large holographic screen in the air or on a surface. No more keyboards as sign language gestures will be recognized and of course, voice commands.

Telephones? You mean LAN line telephones? For the same reason that keys and pens won't disappear, there will be emergency phones that are powered by solar-kinetic street lamps called HYDROLEAVES. So, you'll be able to call someone to rescue you and enjoy some fresh harvested filtered rain/moisture water, take a shower, and charge your devices while you wait. The HYDROLEAF will also act as a shelter. Add some fruit trees and you could probably live under one of these things for years.