i think there is one flawed assumption here. and that is that there will be swarms of unskilled riders clogging the roads who will be a danger to themselves and everyone else. we all were unskilled riders at some point, but quickly got the gist of it. in new york, which is crowded with everyone doing everything, even relatively new riders manage quite well - despite heavy traffic. it takes only a couple of days to acclimate to it. people are fairly adaptable and like mentioned above they can learn how to ride in large groups quickly.