I think registration is not a bad idea - because of the sales of so many multi-copters this holiday season to people who have absolutely no flying skills - what can one expect? There will be incidents - like the infant blinded by a copter, who by the way was an experienced pilot but obviously not experienced enough to know not to fly around babies. (
http://www.dailymail.co.uk/health/ar...ball-half.html). If this can happen to an experienced pilot - imagine what will happen to an inexperienced one who could just run away from an incident without accountability.
Registration is a good idea - because of the idiots who have no idea how to fly. I'm getting in line (online) for registration.
Here's a funny thought. A lot of rc pilots will be crying and complaining about registration but I'll bet when I look at their builds and blogs in the future their aircraft will have nice big bold registration numbers on their planes (not on a slip of paper inside the fuse).