My understanding is they want to operate through the summer to get an understanding and procedures in place for the summer storms. It makes sense to know the evacuation procedures and how long it will take to do a full evac when a storm comes up rather than get caught off guard. While they "know" they'll have to evac when a storm approaches, actually doing it may be a different matter.
Also, apparently Doppelmayr is under contract to oversee the system for five years, so they will have company representatives on site when hurricanes and other big storms hit until they know exactly what the impact will be.