Seems like it might be useful for finding downed aircrafts and other missing objects....maybe even people?
Great thought, but the time to process lidar data takes a while. So planes and objects sure, but even the logistics to get this done takes time. Not sure about people, due to resolution over a vast area and again logistics. The bare-earth relief (which strips away a degree of vegetation) lidar offers is incredible. Cartographers and geologist have only recently really taken advantage of the technology. But in time and $, these other uses could definitely be considered, especially when resolution and processing is more developed.
"The fundamental principle of science, the definition almost, is this: the sole test of the validity of any idea is experiment." -- Richard P. Feynman