I can see VR for education purpose. Like see wonders of the world or look a engines/buildings/etc. without having one in the classroom.
It can not replace the real thing. But it will give people a better understanding when seeing it in 3D, and you can look around the object instead of just a flat picture in a text book.
AR. I can see some heads up display helpers. But to many and it will be to much of a distraction. So AR has to be very cheap for people want to buy them for so little use they will give.
But using the VR googles as personal display when traveling on a plane/bus/train/etc. will proppely be the most common use of the googles.
For gaming. I can see some use. (And I personally would get one for this). But again I thing it will go the way of Kinetic and Wii remote. It's a fun new gadget. But people don't want to move around that much. They just want to sit and relax with there game.