Since you're (somewhat?) divorced from timing issues, can you use this sort of thing to implement the "high resolution video display" that people keep asking for? (rendering high-level graphics objects and text "on the fly" as it were?)
I'm not 100% sure I understand your question.
You could--at least in theory--create a high-resolution (but probably low refresh speed) screen but that would still need to be displayed on a full (or thin client) system with a standard monitor. So, I'm not sure if it would really provide what people want--given you could just transfer the data used to create the display and display it locally on the PC.
I haven't managed to envision a scenario in which it would make more sense to generate the display on the Arduino rather than just transmitting the raw data and creating the display on the viewer PC--unless it's to eliminate the need for installing specific software other than a VNC viewer on the machine.
--Phil.