you are so focused on what is the 'norm' today that you are completely blind to the future.
remote display uses that are going to become very common in the near future (especially when connected to mobile devices that do not have the CPU power to render locally, then ship VNC style full-frame images out to the remote display)
1. Google Glasses style head mounted displays.
Google is far from the only company working on this sort of thing. Many of these uses are text or simple geometric objects overlayed on the live video, shipping the video to the phone, doing the overlay, and shipping the result back out is wasting a lot of bandwidth, and battery. Not Going To Happen (at least not for very long). What's going to happen is the video will get shipped to the phone (although not necessarily in full resolution), the phone will craft the overlay, and the overlay will be transmitted back to the headpiece to be combined there with the direct feed from the camera.
2. remote displays (frequently wireless) from mobile devices to large, high-res displays.
Haven't you seen any of the many TV shows or movies recently that show people pulling something up on a phone/tablet and then 'flicking' the window over to the full display? What makes you so sure that this is not going to happen?
There are probably a lot of other examples that people could point out, but just because you don't currently use remote displays doesn't mean that they aren't going to be very popular very soon.