A Transportation Alternative to the Roosevelt Island Tram and Subway?

Via Andrew Sullivans's Face of the Day feature, this picture shows a third grade student from China using a zip line to cross the Nujiang River to get to school (Photo by China Pictures/Getty Pictures). In the event that the Tram is out of service for a period of time, perhaps the zip line can be used for transportation off the island if this method from an earlier post can not be used.
This picture also tells alot about the desire for education by these children.