This has been an idea of mine for years, I am honestly surprised someone has not started it. Basically what if you took satellite images from NASA/Google Earth, and used them to make a comprehensive role playing video game of our own real world. We have had google earth for almost a decade now. I know it would take some serious work to turn satellite pictures into a video games, but most of the work seems to be already there, just make the buildings, some trees, and finally enemies and people, and bam, your done.
Is it because no one would play it? I would play it in a heart beat, I don't know about you.