Paul will do a great job minimizing impact. Keep in mind that these areas are already very impacted. The large group size will not further impact the trail (it is a durable surface). Splitting the group between 2 climbs at once (say eureka and father and son) will be lessening impact as well.
Yes, the group is larger than I would take, but with care and dedication, impact can be minimized. I would suggest that a service project be included in the price of the trip... say building some nice steps up the steep climb up to the area. everybody carries a 2x6 and voila! That'd stop the complaining huh?
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