Seriously, everyone should be responsible for themselves ICE... get an ICE tag, ffs. As in life, as on this forum, you are ultimately responsible for your own actions, and should both live and ride accordingly. If you are the type to jump out of airplanes with a light canvas strapped to your back, have some sort of ICE information on you.
To burden a single organiser with the responsibility to look after you if you had to come pipe is also unfair - he might be having a good time at base camp 10 beers deep, out of cellphone range.
Be practical about it - if you're in a small group, share ICE details, and keep copies of each between you. AND HAVE YOUR OWN ICE INFO READILY AVAILABLE, on your wrist, helmet, wherever.