One overlooked usecase is RDP and VNC-like concepts. Right now Appetize (App streaming service) uses raster graphics. Vector would allow high-FPS streaming of Apps, making running Apps in the cloud a realistic option.
The best thing to do is just use a modern video codec and make sure it works well with text and sharp edges.
You can certainly leverage that, but it also increases the resource demands (and thus power demands) on the client.
Try remoting into a machine over RDP and playing a youtube video occupying a large portion of the screen. You may be surprised to find that it plays nearly perfectly, even over non-ideal network conditions (wifi). Try this same exercise with VNC and you will experience a frame maybe once every other second.
I am not sure exactly the heuristics involved, but RDP is certainly switching between modes of operation based on what kind of visual information is on the screen.