Looks like the wheels are in motion to put in place a tribute cache, check out this groundspeak forum thread:
I think I'd still recommend a visit to the area. We completed the Triad in May 2 weeks before it went missing, and there are some other great and historical caches in the area. I wouldn't also mind returning one day to actually do the walk through the 'Tunnel of Light' that has been closed for the last year and a half!
Looks like WSGA Going APE...All Over Again
Event will be extra special with a tribute cache being placed to keep the spirit alive. Especially since it will contain all sorts of cool donated Planet of the Apes swag, matching container and painted to match, etc.