Well by 2015 it would be ten years since Episode 3, and while I agree things shouldn't be rebooted that quickly, these days that seems like a respectable time to wait. The Incredible Hulk rebooted after 5 years, Spiderman also 5 years, Superman 7 years, the Girl with the Dragon Tattoo only 2 years.

After all the released info so far suggests E7 in 2015 I doubt they will go this route, but I still think it would be the easiest route for them to make money, and possibly result in better new films.