I had always imagined the one day races grew out of the daily commute, and the stage races were more like a getaway scenario. I mean who wants to spend just one day in the mountains; it doesn't seem the same as a day in the city or in the country. On that note, it is probably best to have classics in populated areas, or you get all the crazies like on Huez getting wasted and bored and messing with the riders, blocking the road, etc. Remember the Alpe ITT? On a more tolerant note, much of the excitement in mountain stages comes from the GC dynamics. It is hard to imagine a Fuenta De '12 or Galibier '11 in a one day race.