Footlights being that old will be full of
asbestos wiring, so they'll need to be completely dealt with either way (rewire). It seems that
Altman has discontinued their
line of "disappearing
footlights", which would have been an excellent solution. It basically rotates under the
stage (strong, finished wood
cover on the back side) when not in use. Perhaps there is some other product that is similar, though it will most likely be a special order. You could also do a temporary groundrow of modern
R40 striplights (which double as
footlights), which may fit in to the trough with some modification. I'm just addressing replacing the
current strips at this
point, because they do need to be replaced or rewired given their
current age. As for the
safety aspect, it is possible that you could be permitted to do away with the trough and add the
R40's and some decorative scalloped
masking (sometimes called "dental") on a temporary basis. Heck, the
masking could be a permanent feature and at least a physical (albeit small) barrier at the lip of the
stage.
My theory is that the fact that the kid fell in to the trough is bad, but not as bad as it could have been. Had the trough not been there, he would have probably fallen off the
stage, which would have been worse. Stages are just dangerous and people need to watch what they're doing. The simplest thing I can think of in lieu of all the suggestions above would be to route out a
groove just in front of the footlight trough and recess a
line of ropelights. I've seen this done on a lot of high school stages, and at the very least it says "Hey, something changes beyond this
point! Notice me!"