If we assume today's technology, based on my own play, this course would need to be 9000+ yds. I think. Maybe my math is off, but h certainly don't think it would be less. A statute mile is 1760yds. So you've just added a minimum of a mile and a half to the walk. Also, you've greatly decreased margin of error for advancement of the ball (long clubs are harder to hit). Im guessing that a 2-ball, by two relatively in shape folks would now take 4 hours. Which means normal rounds by non-GCA.com'rs would be 5.5hrs.
So yeah, I'm out. That sounds awful.