When will the Harding Ice Field Trail be considered a course for an endurance run among the elite trail runners, &/or ask the Nat'l Park Service advice on how to proceed for that type of event to take place on an annual basis?

Unlike the Mt Marathon event where scores can approach in a free-for-all, the trail up from Exit Glacier would have to be a timed event; limited numbers of travelers with checkpoints in strategic locations along the arduous route. Plus a few paramedics. 

A 3,000Ft climb over a short distance.

Perhaps a standby helicopter to bring in the wounded. A great place one could be kept waiting, is the large curve before Resurrection River Bridge, just outside the main parking area. We used that in 1998, as helipad to stage a backcountry 'historical cabin restoration' project, inland at KEFJ/NP.

Another route may include some old mountain paths that used to be hard rock mining roads; most impassible except for by foot. With machete. ;)